Heavy-Duty Truck And Trailer Repair in San Antonio
Full-service truck and trailer repair in San Antonio, plus mobile roadside assistance and fleet maintenance programs that keep your trucks moving.
- Fast scheduling and quick-turn heavy-duty repairs
- Full in-shop, roadside, and towing support in one place
- Fleet-friendly communication, scheduling, and billing
General Diesel Truck Repair - Trailer Repair & Maintenance - Emergency Roadside & Towing - Fleet Maintenance & Inspections - Engine, Drivetrain & Transmission - Brakes, Suspension & Steering - Electrical & Diagnostics - RV, Bus & Heavy Equipment Repair -
What We Fix and Service
General Diesel Truck Repair
From check-engine lights to drivability issues, we perform complete diesel truck diagnostics and repair on Class 6–8 trucks and vocational vehicles.
Trailer Repair & Maintenance
We repair brakes, lights, suspension, landing gear, doors, and electrical on dry vans, flatbeds, utility, and equipment trailers.
Emergency Roadside & Towing
We provides mobile roadside service and coordinates towing to our shop when needed.
Fleet Maintenance
& Inspections
We build maintenance programs around your routes and schedules to keep trucks on the road and out of the shop.
Engine, Drivetrain & Transmission
We handle everything from minor engine repairs to overhauls, drivetrain issues, clutches, and transmissions.
Brakes, Suspension
& Steering
We service brake systems, air lines, suspension components, bushings, and steering issues to keep your drivers confident and compliant.
Electrical & Diagnostics
Modern trucks depend on complex electrical and electronic systems. We use advanced diagnostics to troubleshoot warning lights, starting/charging issues, sensors, aftertreatment systems, and more.
RV, Bus & Heavy Equipment Repair
Have an RV, bus, or piece of heavy equipment down in or near San Antonio? Our technicians repair many popular diesel-powered RVs, buses, and off-road machines to keep your trips and jobs on track.
Truck Repair
Provides full-service heavy-duty truck and trailer repair to keep owner-operators, fleets, and working vehicles safe, compliant, and on the road. Whether you come into the shop or need help getting rolling again, our technicians focus on fast troubleshooting, clear recommendations, and repairs done to withstand real-world loads, heat, and miles. We perform complete diesel truck diagnostics and repair on Class 6–8 trucks and vocational vehicles. We track down the root cause instead of just clearing codes. From check-engine lights and electrical faults to braking issues, air leaks, and wear-and-tear items, we diagnose the root cause and prioritize the repairs that get you back to service with confidence. If you’re managing a fleet, we can help reduce downtime with preventive maintenance and repair planning that fits your routes and schedules.
Emergency Roadside Service & Towing
When a truck or trailer fails on the road, every minute matters. Our emergency roadside service team is ready to help with mobile diagnostics and repair in the San Antonio area, and we can coordinate towing to our shop when repairs can’t be safely completed on-site. One call gets you moving toward a solution instead of waiting for multiple vendors. - Mobile diagnostics for no-starts and breakdowns - Tire, wheel, and minor mechanical repairs on the roadside when conditions allow - Coordination of towing to our facility for major repairs - Support for trucks, trailers, RVs, and some equipment - Clear communication with drivers and dispatch throughout the process If you’re dealing with a “diesel repair near me” emergency search on the side of the road, call our team first. We’ll help you figure out the fastest and safest path to get that unit back in service.
Fleet Maintenance Programs
Fleets need more than one-off repairs. They need a partner who understands routes, utilization, and downtime costs. We work with local and regional fleets in and around San Antonio to build preventive maintenance programs that fit your schedule and compliance requirements. - Custom PM schedules based on mileage, hours, and duty cycles - Oil changes, filters, fluids, and inspections in one appointment - DOT and safety checks to help you stay ready for inspections - Priority scheduling for established fleet customers - Clear estimates, approvals, and invoicing for your office
Trailer Repair & Maintenance
Your trailers work just as hard as your trucks. Neglected brakes, lights, or suspension can lead to violations, breakdowns, and unsafe conditions. Our team performs complete trailer repair and maintenance to keep your assets safe and productive. - Brake system repair, air lines, and chambers - Suspension components, bushings, springs, and axles - Lighting, wiring, and electrical troubleshooting - Doors, hinges, seals, and flooring repairs - Preventive inspections between long hauls Whether you run a few flatbeds or a mixed fleet of dry vans and equipment trailers, we help you stay ahead of failures and avoid out-of-service violations.
Engine, Drivetrain & Transmission
Heavy-duty engines and drivetrains are complex systems that demand the right tools and experience. We diagnose and repair issues affecting power, shifting, and reliability so your trucks can keep pulling loads without constant trips back to the shop. - Engine diagnostics, repairs, and overhauls - Aftertreatment system and emissions-related repairs - Clutch replacement and adjustment - Manual and automatic transmission repair and replacement - Driveline and differential inspection and repair If your truck is losing power, shifting poorly, or throwing repeated codes, we’ll help you get to the bottom of it and recommend a practical repair plan.
DOT Inspections & Compliance Services
Staying compliant isn’t optional. We help fleets and owner-operators prepare trucks and trailers for DOT inspections and address issues before they cause fines or downtime. - Pre-DOT inspection checks on trucks and trailers - Documentation of defects and recommended repairs - Corrective repairs to brakes, lights, suspension, and other safety items - Assistance preparing units for roadside and scale inspections If your equipment is due for inspection or recently failed one, bring it in and we’ll help you get it back into shape.
Why South Texas Fleets Trust us
Expert Diesel Repair
Precision diagnostics and engine repairs for Class 6–8 diesel trucks from our Converse, TX facility.
Roadside Assistance
Dependable mobile diesel mechanic support and emergency roadside service for the San Antonio area 24/7.
“We treat every rig like it needs to get back to work—not just back on the road.”
Trailer Maintenance
Complete trailer repair services including brakes, suspension, and structural safety support.
Fleet Maintenance
Strategic maintenance programs designed to cut downtime and simplify operations for fleet managers.
San Antonio’s Reliable Source for Diesel Truck & Trailer Repair
- 24/7 Roadside Diesel Service
- OTR & Regional Carrier Support
- Class 6-8 Engine Diagnostics
- Construction & Industrial Heavy Equipment
- Mandatory DOT Compliance Inspections
- Emergency San Antonio Roadside Service
- Full Trailer Brakes & Lights
- Dry Van & Flatbed Repair
- Fleet PM Service Programs
Texas Truck & Trailer Repair is your partner for maximizing uptime and minimizing roadside surprises.
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“Texas Truck & Trailer responded instantly when our rig was down. Their communication was crystal clear, and the roadside repair was handled with professional speed.”
Local Owner-Operator
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“Since partnering with them for fleet maintenance, our downtime has dropped significantly. Their scheduling is dependable and fits our routes perfectly.”
Logistics Fleet Manager
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“Finding an honest shop is tough, but these guys give clear recommendations and fair pricing every time. No surprises, just quality heavy-duty repair.”
Regional Carrier Supervisor