RV Undercarriage& Lighting Inspection
Comprehensive & detailed safety inspection of your RV's undercarriage and lighting systems.
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Tell us about your coach and we will get back to you. Prefer to talk now? Call 702-757-2471.
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Safety Checks
What We Inspect
Check Holding Tanks and Support Straps
Inspect Frame for Stress Cracks or Damage
Check Bolts and King Pin Box for Damage
Inspect Operation of Break-A-Way System
Inspect and Test Operation of 7 Way Plug
Inspect Stop, Tail and Turn Light Operations
Inspect Clearance Light Operations
Schedule Your Inspection
Don't wait for a breakdown on the road. Get your undercarriage and lighting systems inspected by our certified technicians today.
Schedule Inspection: 702-757-2471What Fails Underneath, and How It Shows Up
Nothing on the underside of a coach warns you before it fails. The tank straps do not creak, a frame crack does not change how the coach drives, and a corroded ground makes the lights work perfectly until the day it rains. That is why these seven checks are done with the coach on a lift and a light in hand rather than from a walk around.
Holding tank straps carry the full weight of a loaded tank over every bump. When one stretches or its bracket loosens, the tank flexes on its outlet fitting, and the first sign is a drip at the dump valve on a tank that has never leaked. Frame stress cracks gather where load concentrates: around spring hangers, at welds where the rail steps, around slide room and generator bay cutouts, and at the king pin box on a fifth wheel. On towables, the break-a-way switch, its cable and the small battery behind it are checked as a system, because a dead battery there is common and completely silent.
The lighting checks are electrical work done underneath. A seven way plug corrodes from the inside, a frame ground loosens, a wire chafes at a frame pass-through, and the result is lights that flicker on bumps or a brake controller that throws an error at random. The plug and grounds are tested under load. If the fault turns out to be on the coach side of the plug, in the converter, breakers or house wiring, that is covered by the electrical inspection and charging system check-up, and a break-a-way battery that will not hold a charge is a battery service question.
Why the Desert Is Hard on the Underside
Road salt is not the problem here. Heat, ultraviolet light and vibration are. UV reaching under the coach in a parking lot hardens wire insulation until it cracks at the first flex, and heat radiating off asphalt ages tank plastic and the rubber in strap isolators faster than the same coach would see in a mild climate. Fine desert dust works into the seven way plug and into every ground connection, which is why a plug that looks clean can still fail a load test.
Washboard access roads at the lake and the dunes finish the job, loosening fasteners that were torqued correctly and working cracks along welds. The underside is also one section of the broader 45 point RV inspection if you want the whole coach checked in the same visit, and the running gear it exposes is where the wheel bearing pack and brake inspectionpicks up.
Undercarriage Inspection Questions
What is the break-a-way system and why is it on a safety inspection?
On a towed trailer or fifth wheel, the break-a-way switch is a pin on a cable tied to the tow vehicle. If the trailer ever separates, the pin pulls and the trailer brakes apply on their own. It only works if the switch is intact, the cable is attached to something solid, and the small battery that powers it is charged. All three are checked, because a dead break-a-way battery is common and invisible until the day it matters.
Why do my trailer lights work sometimes and not others?
Intermittent lights are almost always a connection, not a bulb. The seven way plug corrodes from the inside, a ground strap to the frame loosens or rusts, or a wire chafes where it passes through the frame. A brake controller that throws an error only on bumps is the same fault seen from the cab. The plug and grounds are tested under load rather than with the trailer sitting still.
What do you look for on the holding tank straps?
Sag, cracked or missing fasteners, and a tank that has shifted in its cradle. A full tank is heavy, and the straps and their brackets carry that weight over every bump. A strap that has stretched lets the tank flex on its outlet fitting, which is how a tank that has never leaked starts weeping at the valve.
Where do RV frames actually crack?
At the places load concentrates: around spring hangers, at welds where the frame steps up or down, around the cutouts for slide rooms and generator bays, and at the king pin box on fifth wheels. A hairline crack there does not show from the side of the coach and does not announce itself while driving. Finding one early is the difference between a weld repair and a structural one.
Is the undercarriage inspection for motorhomes or towables?
Both, with different emphasis. On a towable, the break-a-way system, seven way plug, king pin box and trailer brakes are the priority. On a motorhome, the tank straps, frame, exhaust hangers and the lighting circuits are the same checks, and the plug and break-a-way items simply do not apply.
How often should the underside be inspected?
Annually, and before any long trip if the coach has spent months parked. Heat, UV and vibration do the damage here, not mileage alone, so a coach that sits still in the desert for a season still needs to be looked at before it goes back on the highway.
Chassis Work This Connects To
What is found underneath usually leads to one of these.
- Bearings that are dry, noisy or running warm need the wheel bearing pack and brake inspection.
- Dry pivots, hinges and slide mechanisms are handled by the body lubrication service.
- Engine and chassis servicing is covered by the RV oil change.
- On fifth wheels, the 5th wheel landing leg service covers the gear that carries the front of the trailer.
