Terms of Service

Effective 12 October 2026

These terms govern your use of defrx.com and the DEF Rx platform. The platform is owned and operated by Hook & Haul LLC, a Texas limited liability company. In these terms, "DEF Rx," "we" and "us" mean that company, and "you" means the person and the company using the platform.

By creating an account or using the platform, you agree to these terms. If you do not agree, do not use the platform.

1. Who may use DEF Rx

To use the platform you confirm that you are 18 or older, that you are authorized to act for the company you are registering, that your company's information is truthful and accurate, that you have not previously been removed from the platform, and that your use complies with applicable law.

DEF Rx is a business product. It is not for personal or household use.

2. Accounts

Each account belongs to one person. Do not share your sign-in credentials. Keep them secure and tell us immediately at support@defrx.com if you believe someone else has used your account.

You are responsible for what happens under your account. Information you enter must be accurate, and you must keep it current. Where a company account has multiple users, the company is responsible for what its users do.

We may limit, suspend or end access to the platform. Where we do so for a reason other than a breach of these terms, we will give you notice and a pro rata refund of any prepaid subscription period.

3. What DEF Rx is

DEF Rx is a platform. It connects three kinds of user: carriers, service centers and mobile technicians. It tracks maintenance intervals on heavy trucks, records service work, lets a carrier raise a service request, and lets a service center or mobile technician take that request on. It sends reminders to drivers who have agreed to receive them.

DEF Rx facilitates the transaction. It does not perform the work. When a carrier and a provider connect through the platform, the agreement for the work is between those two. They settle the scope and the price between themselves, and either of them may decline the job. DEF Rx is not a party to that agreement. We do not warrant the work, we do not supervise it, and we do not set its price or its scope.

This applies to every provider on the platform, including us. DEF Rx is owned and operated by Hook & Haul LLC, which also operates a service business. When that business takes a job through the platform, it does so as a provider like any other, on these same terms, and it carries the same responsibility for its own work that every other provider carries for theirs.

DEF Rx does not verify the qualifications, licences or insurance of anyone on the platform. We collect insurance details from service technicians and we will not mark a technician as dispatchable when their insurance is missing or expired. That is a check against what they told us. We do not contact insurers, we do not confirm that a policy exists or remains in force, and we do not rate, review or vet anyone. Do not treat a technician's presence on the platform as a recommendation.

Maintenance intervals and warnings are a tool, not advice. Service intervals and due-date warnings are calculated from the mileage and the schedule you enter. They are a convenience. They do not replace the manufacturer's requirements, your own maintenance program, or any legal obligation you have as a motor carrier to inspect, repair and maintain your vehicles. You remain responsible for compliance.

4. Subscriptions, payment and renewal

The seller. Subscriptions to DEF Rx are sold through our payment processor's managed payments service, which makes Link, LLC the merchant of record on the sale. Your invoice will say "Sold through Link, LLC" and your card statement will read LINK.COM* DEF RX. Link, LLC calculates, collects and remits any applicable sales tax. We do not store your card details.

Price and billing. Current prices are shown on the pricing page. Subscriptions are billed monthly in advance. Per-truck charges are calculated on the trucks registered to your account at the start of the billing period.

Automatic renewal. Your subscription renews automatically each month, on the same date, at the then-current price, and your payment method will be charged each time, until you cancel. We will tell you before any price increase takes effect, and a price increase will not apply to a period you have already paid for.

Cancelling. You may cancel at any time from your account settings, or by emailing support@defrx.com. Cancellation takes effect at the end of the period you have paid for. You keep access until then. We do not charge a cancellation fee.

Refunds. Because Link, LLC is the merchant of record, refunds are issued through them as a credit against your card. If you believe you have been charged in error, email support@defrx.com and we will deal with it.

Non-payment. If a payment fails, we will attempt it again and tell you. If it remains unpaid we may suspend access until it is resolved.

5. Text messages

If you are a driver, we will send you text message reminders only if you have agreed to receive them. Our text messaging terms set out the program, the frequency, how to stop messages and who pays for them. Nothing in these terms replaces that consent.

If you are a carrier adding drivers to the platform, you must not enter a driver's mobile number unless that driver has agreed to receive our messages. You are confirming that they have.

6. Your content, and what we may do with it

You keep ownership of everything you put into DEF Rx: your company information, your truck records, your mileage, your service history, your photographs and your signatures. We call this your content.

You grant us a licence to host, store, process and display your content for the purpose of operating the platform and providing the service to you. That includes showing a service record to the other party to a job, and keeping it as a record of the work. We may use your content to maintain, support and troubleshoot the platform.

We may use anonymised and aggregated information, with your company, your people and your vehicles no longer identifiable, to improve the service and to understand how it is used.

We will not sell your content, publish it, or use it to promote DEF Rx without asking you first.

7. What you may not do

You may not access the platform without authorisation, interfere with its security, or attempt to reach data belonging to another company. You may not copy, resell, rent or sublicense the platform or access to it. You may not reverse engineer it, except where the law says you may. You may not scrape it, or use automated means to extract data beyond your own. You may not use it to send unsolicited messages. You may not use another company's USDOT or MC number, or register a company you are not authorized to act for.

You may not enter a person's mobile number without their agreement to be contacted.

8. Our intellectual property

The platform, its software, its design and its name are owned by DEF Rx or its licensors and are protected by law. These terms give you a right to use the service, not any ownership in it. Our names and logos may not be used without our written permission.

9. Disclaimers

The platform is provided "as is" and "as available." To the fullest extent the law permits, we disclaim all warranties, express or implied, including merchantability, fitness for a particular purpose and non-infringement.

We do not warrant that the platform will be uninterrupted or error free, that warnings or calculations will be accurate or complete, that a technician will accept a request, arrive, or perform satisfactorily, or that any information provided by another user is true.

10. Limitation of liability

To the fullest extent the law permits, neither party is liable to the other for indirect, incidental, special, consequential, exemplary or punitive damages, or for lost profits, lost revenue, lost data, or business interruption, whether or not the possibility was known.

Our total liability to you, for all claims arising out of or relating to these terms or the platform, will not exceed the greater of the amount you paid us in the 12 months before the claim arose, or $100.

Nothing in this section limits liability that cannot be limited by law, including liability for fraud, for willful misconduct, or for death or personal injury caused by negligence.

11. Indemnity

You will defend, indemnify and hold us harmless against claims, damages, losses and reasonable costs including legal fees arising from your breach of these terms, your content, your use of the platform, your failure to obtain a driver's agreement before entering their number, or any service work performed by or for you.

12. Disputes

Informal resolution first. Before starting arbitration, tell us about the dispute at legal@defrx.com and give us 30 days to resolve it. We will do the same for you.

Arbitration. If we cannot resolve it, any dispute arising out of or relating to these terms or the platform will be resolved by binding arbitration administered by the American Arbitration Association under its Commercial Arbitration Rules, before a single arbitrator, seated in Harris County, Texas. The arbitrator's decision may be entered as a judgment in any court with jurisdiction.

Small claims. Either of us may instead bring an individual claim in small claims court in Harris County, Texas, if it qualifies.

No class actions. Claims must be brought individually. Neither of us may bring a class, collective or representative action, and the arbitrator may not consolidate claims or preside over one.

Injunctive relief. Either of us may seek injunctive relief in a court in Harris County, Texas to protect intellectual property or confidential information, without first arbitrating.

13. Governing law and venue

These terms are governed by the laws of the State of Texas, without regard to its conflict of laws rules. Subject to the arbitration provisions above, the state and federal courts located in Harris County, Texas have exclusive jurisdiction, and both of us consent to that venue.

14. Changes to these terms

We may change these terms. If a change is material, we will tell account holders at least 30 days before it takes effect, and the change will not apply to a subscription period you have already paid for. Continuing to use the platform after a change takes effect means you accept it. If you do not accept it, cancel before it takes effect and we will refund the unused part of your current period.

15. Copyright complaints

If you believe material on the platform infringes your copyright, send a notice to legal@defrx.com identifying the material, identifying the work you say is infringed, giving your contact details, stating that the use is unauthorised and that you believe so in good faith under penalty of perjury, and signing it.

16. General

These terms and the Privacy Policy are the entire agreement between us about the platform. If we do not enforce a provision, we have not waived it. If a provision is unenforceable, the rest stays in effect and the unenforceable provision is limited to the minimum extent necessary. You may not assign these terms without our consent. We may assign them in connection with a merger, acquisition or sale of the business, and will tell you if we do.

Contact

support@defrx.com or (888) 603-3379 for the service. legal@defrx.com for anything in these terms. privacy@defrx.com for your data.

Hook & Haul LLC d/b/a DEF Rx 5105 Jefferson St., Unit 1 Houston, TX 77023