Maintenance
RV Maintenance Every Full-Timer Must Know
Slide-outs, seals, generators, and tires — the systems that will strand you if neglected, and the schedule that prevents it.
15 min read
Full-timers put more miles and hours on their rigs than the typical RVer — often 15,000–25,000 miles per year. The maintenance tasks that a weekend camper can postpone become real problems at full-timer scale. The good news: most catastrophic failures are preventable with a consistent schedule and basic mechanical awareness.
You don't need to be a mechanic. You need to know what to inspect, what to listen for, and when to call someone who knows more. This guide covers the critical systems.
Tires
Highest Priority — Tire Failure at Speed is Catastrophic
Tire blowouts are the leading cause of catastrophic RV accidents. Most blowouts are preventable. RV tires degrade from UV exposure and age even when not driven — a tire with good tread but 6+ years old is a risk. Replace tires every 5–7 years regardless of tread depth.
Weekly Checks
- → Check tire pressure when cold — before driving
- → Inspect sidewalls visually for cracks, bulges, or damage
- → Verify lug nut torque after first 50 miles on new tires
- → Check for uneven wear — indicates alignment or suspension issues
Buy These Now
- → TPMS (Tire Pressure Monitoring System) — alerts you to pressure loss while moving
- → Torque wrench — verify lug nut torque yourself
- → Quality tire pressure gauge — analog is more reliable than digital
- → Tire covers — UV protection adds years to tire life
Roof and Seals
High Priority — Water Damage is the Most Expensive RV Repair
A failed roof seal causes water intrusion. Water intrusion causes rot and mold in the walls, floor, and ceiling. By the time you see interior water damage, the structural damage has been happening for months. Inspect your roof and all seals every 3 months — more often if you travel in heavy rain.
Roof inspection
Get on the roof every 3 months. Check the material (EPDM rubber, TPO, or fiberglass) for cracks, punctures, or lifting. Pay special attention to seams — where roof panels meet, and around every protrusion (vents, AC units, antennas). Use Dicor lap sealant for EPDM roofs; use compatible sealant for TPO.
Window and door seals
Inspect the sealant around all windows and doors from the exterior. Look for cracking, separation from the surface, or missing sealant. Run your hand along the edges — you can feel gaps. Recaulk any questionable areas proactively.
Slide-out seals
The rubber wiper seals on slide-outs wear and crack over time. Inspect them every 3 months and clean them with 303 Aerospace Protectant — this extends seal life significantly. Replace any seal that is cracked or no longer making contact with the slide-out wall.
Interior moisture check
Press on walls, floors, and ceiling near slide-outs and windows — soft spots indicate water damage inside the wall cavity. Check under the refrigerator and in storage bays for moisture. A moisture meter (~$30) makes this systematic.
Slide-Outs
Slide-out mechanisms are the most complex mechanical system in most RVs. They extend and retract thousands of times over the life of the rig. Lubrication and alignment keep them working; neglect makes them fail — sometimes in the out position, which is an expensive problem.
Monthly Maintenance
- → Lubricate slide rails with dry slide lubricant (not WD-40)
- → Clean slide-out seals and apply 303 Protectant
- → Listen for grinding or hesitation — early warning signs
- → Check that slide operates smoothly in both directions
- → Inspect the underside for debris, leaves, or obstructions
Warning Signs
- → Grinding or unusual noise during operation
- → Slide moves slower than usual
- → Slide doesn't fully retract or extend
- → Visible gap between slide wall and main wall when retracted
- → Water intrusion near slide-out corners
Generator and Engine Systems
For motorhome owners, engine maintenance is as important as any RV-specific system. For fifth wheel and trailer owners, generator maintenance is the equivalent. Both require consistent attention.
Generator Maintenance
- → Run your generator 2 hours per month under at least 50% load — prevents varnish buildup in carb
- → Change oil every 100 hours or annually
- → Check air filter every 6 months
- → Use fuel stabilizer if the generator sits idle for 30+ days
- → Exercise the generator before a trip if it's been sitting
Motorhome Engine
- → Oil change per manufacturer schedule — often 5,000–7,500 miles for diesel
- → Check coolant level monthly
- → Inspect belts and hoses every 6 months
- → DEF (diesel exhaust fluid) check on diesel engines
- → Annual chassis lube if not automatic
The Full-Timer Maintenance Schedule
Tire pressure check, fresh water tank top-off, battery voltage check, exterior visual walkaround
Slide-out lubrication, generator exercise run, propane system check, fire extinguisher inspection, roof vent seals
Roof and seal inspection, slide-out seal conditioning, water heater flush (if flush-enabled), tank treatments
Generator oil change (if 100+ hours), brake inspection, leveling jack lubrication, hose and belt inspection
Engine service (motorhomes), tire age check, full roof recoat (if needed), awning mechanism lubrication, AC filter cleaning, water heater element inspection
Tire replacement regardless of tread, roof material assessment and possible replacement, slide-out seal full replacement
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