J & J Mobile Truck, Semi & Trailer Repair is a mobile diesel truck repair company in Detroit, Michigan. We are on-call 24/7 and offer emergency road repair service! Quick response time for roadside Semi Truck Repairs and Competitive rates stay the same regardless of time of day, holidays or weekends. Our mobile roadside assistance can help with Semi Tire repair, Trailer repair, custom made hydraulic hoses, and truck refrigeration repair including Thermo-King, Carrier and more. We have common semi truck parts in stock most of the time. In stock we carry drive-shafts, transmissions, engines, tires, rims & more. If the job is too big for road service we have shop availability. Give us a call if you are broke. down in your diesel truck, or in need of truck parts.