Mobile Kingpin Trailer Repair & Replacement
Complete upper coupler fabrication, structural welding, and semi trailer kingpin plate replacement performed on-site at your distribution yard in Sacramento, Stockton, Modesto, Tracy, Fairfield, Dixon, Roseville, Elk Grove, Lathrop, Manteca, West Sacramento & Woodland. One of the few services in Northern California performing mobile kingpin replacement. Fleet yards 100+ trailers only.
Worn Kingpin on Trailer? Fix It Before It Gets Red-Tagged.
A worn kingpin on a trailer creates fifth wheel "slop," hard clunks, and unsafe coupling. It's also one of the fastest ways to get flagged during a BIT / CHP inspection.
Most shops require towing the trailer to a facility. TruMac Fleet Services performs mobile kingpin trailer repair and upper coupler plate replacement directly in your yard—so your asset stays inside your operation. This is a rare specialty service in Northern California.
- ✅ Semi Trailer Kingpin Plate Replacement (Cut-Out & Rebuild)
- ✅ Kingpin Resurfacing (When wear is still within safe tolerance)
- ✅ Upper Coupler Structural Welding & Reinforcement
- ✅ Crossmember / Channel Iron Repairs Under the Coupler
- ✅ Fleet Yard Only • Mobile Dispatch • No Roadside Calls
NorCal Fleets: This Is the Mobile Fabrication Shop
If your trailer is parked at a DC, intermodal yard, or logistics hub—this is exactly where our mobile kingpin replacement service operates. We focus on in-yard repairs so maintenance directors avoid towing, scheduling bottlenecks, and shop backlog. We specialize in fleet yards with 100+ trailers.
Stop Downtime
Keep trailers in your yard and shorten the out-of-service window with mobile dispatch.
Reduce Tow Costs
Upper coupler plate work is expensive enough — towing shouldn't be the hidden multiplier.
Inspection Readiness
Fix clunk, slop, cracks, and plate wear before BIT/CHP forces the decision.
Kingpin Repair FAQ (NorCal Fleet Guide)
Common questions about mobile kingpin replacement and upper coupler repair for fleet operations
Can you replace a trailer kingpin without towing it?
Yes. TruMac performs mobile kingpin trailer repair in your fleet yard in Stockton, Sacramento, Modesto, and Tracy. We bring the cutting, fitting, and welding capability to the unit so it stays on-site. This is a rare specialty service in Northern California.
How do I know if my kingpin is worn out?
Signs include heavy clunking during start/stop, abnormal fifth wheel movement, visible wear grooves, and coupling that no longer feels tight. A gauge check confirms if wear exceeds safe tolerance.
Will a worn kingpin fail a BIT / CHP inspection in California?
It can. A worn kingpin on a trailer or a cracked upper coupler plate can trigger an Out-of-Service condition. Mobile correction at your yard can prevent prolonged downtime.
Do you offer roadside kingpin repair calls?
No — TruMac is a mobile fleet yard service only. We operate in controlled yard environments, not freeway roadside locations. We focus on fleet yards with 100+ trailers.
How much does mobile kingpin trailer repair cost in Sacramento?
Pricing depends on whether you need resurfacing or full semi trailer kingpin plate replacement. The biggest savings is avoiding tow + shop backlog. We quote fleet-yard work for Sacramento, Roseville, Elk Grove, and West Sacramento.
Can you perform kingpin on trailer repair on-site in Stockton?
Yes. We dispatch into fleet yards near Arch Road and the Stockton logistics corridor, plus Tracy, Lathrop, and Manteca yards. We handle kingpin replacement, upper coupler plate work, and structural repairs without the trailer leaving your operation.
Do you fix collapsed landing gear in Tracy or Lathrop?
Yes. Landing gear collapse often happens after hard drops or uneven loading. We service distribution yards in Tracy, Lathrop, and Manteca for landing gear replacement and structural welding — fleet yard only.
What other coupling system repairs do you offer?
In addition to kingpin replacement, we handle pintle hooks, lunette rings, fifth wheel connections, hitch repairs, and coupler systems. All services are performed at fleet yards across Northern California.
Hitch & coupler repair services →
Pintle hook & lunette ring repair →
Serving Stockton & Tracy Logistics Hubs
Fast dispatch to Arch Road, South Stockton distribution yards, Tracy logistics corridor, Modesto freight terminals, and Sacramento-area fleet yards. Fleet yards 100+ trailers only — no roadside.
Request a Kingpin Inspection Bid
Mobile upper coupler and kingpin plate service for fleet yards with 100+ trailers in Stockton, Sacramento, Modesto, and Tracy. Share unit count + location + urgency — we'll respond with dispatch options. Photos of completed kingpin work available upon request.
Fleet Yards 100+ Trailers Only • Mobile Yard Service • No Roadside Calls
Rare Specialty Service: One of Few Performing Mobile Kingpin Replacement in Northern California