RV Maintenance Checklist: A Seasonal Schedule for a Used RV

A used RV needs a written schedule, not good intentions. The work splits into four rhythms: before each trip, monthly in season, each spring and fall, and yearly. Most of it an owner can do with a flashlight, a moisture meter and a few hand tools. Propane, gas, 120-volt and 240-volt electrical and generator work is a job for a qualified RV technician, and no checklist changes that. What follows is the schedule, what each item catches, and what to hand off.

The seasonal RV maintenance schedule

Use this as the backbone. A used RV may have sat through a season or more of neglect, so the first pass through the yearly list matters more than any later one.

Before each trip: the walk-around that catches most problems

Start at the roof. Sealant dries, cracks and lifts with age, and a crack the width of a hair can let in enough water over a season to rot a wall. Look at every seam, around roof vents, the cabover, slide-out edges and corners. If the sealant is cracked or pulling away, renew it before the trip. On a used RV, assume the previous owner did not.

Check tires cold, with a gauge, against the pressure for the actual load. Read the DOT code on each sidewall: the last four digits give the week and year of manufacture. A tire can look fine and still be past its safe life. The full method is in RV tires: age, load and pressure.

Test every light, including brake lights and turn signals, and test the breakaway switch on a trailer. Check the coach battery: flooded lead-acid needs its water level checked and topped up with distilled water. Press the test button on each alarm and read the replace-by date on the unit.

Open and close the slide-outs and watch the seals. A torn seal lets water in every time it rains. Unroll the awning and look for rips and bent arms. Fill the fresh tank, check the dump hose and the tank valves, and confirm the water heater is full before anyone switches it on.

Monthly in season: the short loop

Once a month while the RV is in use, repeat the roof and seal check, the tire pressure check and the battery check. Run the generator under load for a while; a generator that sits unused is the one that fails when needed. Test the alarms again. Wipe and inspect slide-out and window seals. This loop is short and heads off many of the expensive surprises.

Spring: de-winterize and inspect the running gear

Spring is when the water system comes back. Fill, pressurize and look for leaks at every fitting before the first trip. If the RV was winterized properly, this is routine; if it was not, split lines show up now. The full sequence is in how to winterize and store an RV, and de-winterize it in spring.

Spring is also when the chassis and running gear get attention. Wheel bearings, brakes, brake magnets and the breakaway system are a job for a qualified RV technician. So is the chassis service: engine oil, coolant, belts, hoses and filters on a motorhome. On a towable, the tow vehicle’s own service schedule applies as well.

Renew any cracked or lifting roof and seam sealant in spring, before the first trip, not after the first leak. A moisture meter run along interior walls, ceiling and floor finds damp that cannot be seen. Any soft spot, stain, ripple or musty smell needs investigating; the patterns to look for are set out in spotting water damage and delamination in a used RV.

Fall: winterize and put it away dry

Before storage, the water system must be drained and protected. Water freezes at 32 °F and expands by about 9 percent as it does, which splits pipes, fittings, valves and tanks. Drain the fresh tank, water heater and lines, bypass the water heater, then either blow the lines out with low-pressure compressed air or pump non-toxic propylene glycol antifreeze through every faucet and into the drain traps. Never put automotive antifreeze in an RV water system. The step-by-step is in how to winterize and store an RV.

Check the roof and seams once more before the RV sits. Water that gets in during fall can sit in a seam all winter. Remove food, disconnect or maintain the battery, and cover the tires or block them from sun. In storage, rodents, flat batteries, sun on tires and drying seals are the usual damage.

Yearly: what goes to a qualified RV technician

Some work should never be a DIY project. Propane system leak testing, regulators, lines and appliances are a job for a qualified RV technician. So is any work on 120-volt or 240-volt wiring, the converter, the inverter or the generator. Generator exhaust contains carbon monoxide, and a generator must never run with its exhaust blocked or near open windows. The safety basics are in RV propane safety: tanks, leaks and detectors and RV electrical basics: 30 amp vs 50 amp, batteries and generators.

A yearly technician visit should cover the propane leak test, appliance check, generator service and an electrical inspection. Ask for the findings in writing. On a used RV with no service records, this first yearly visit is the baseline for everything after.

What goes wrong: the mistakes that cost the most

Water damage is among the most common and most expensive defects in used RVs, and it often starts with a seal nobody checked. A cracked seam, a torn slide-out seal or a dried roof vent gasket lets water in quietly. By the time a stain shows inside, the wall behind it is often soft. Inspect the roof and seams on the schedule, not when a leak appears.

The second common mistake is trusting the tires. RV tires often age out before the tread wears out. Common guidance is a yearly inspection once tires are 5 years old and replacement no later than 10 years from the date of manufacture, whatever the tread looks like. A tire that fails at highway speed damages the RV and anything nearby.

The third is switching on a water heater that is not full of water. A dry electric element can burn out almost at once, and firing the burner on an empty tank can damage the heater. Fill the system and bleed the air first, every time after winterizing.

The fourth is treating the generator as self-maintaining. It needs exercise under load and service by a qualified technician. A generator that will not start is a common first-trip failure on a used RV.

The fifth is skipping the alarms. Smoke, carbon monoxide and LP gas alarms have replace-by dates. Test them monthly in season and replace them by the date on the unit. A detector that no longer alarms gives no warning at all.

Finally, keep records. A folder of service dates, sealant renewals, tire dates and technician findings is the single best tool for judging the next repair and for showing a future buyer the RV was looked after.