If you don't end up getting an inspection, a few things to look for:
- put a good amount of water into the system and pressure test every hose. Basically run it like you are camping. Run each tap for various lengths of time.
- Check the ceiling for leaks, and get a ladder and look on the roof for leaks.
- Check the propane system. Furnace, water heater, fridge, stove. The fridge may take 15 minutes to get cold. Check the stove first to make sure there is pressure in the line. My fridge takes a lot longer to fire unless I run the stove first.
- Electrical. Bring a multimeter and check the battery before it has had a chance to charge. An almost dead battery having been charged for a while can still show over 12.5 volts. When charging on electrical power you should be getting 13.5 to 14.5 volts. Check every plug in and light fixture.
- Make sure you know the capacities of each tank; fresh, grey and black. Some trailers have odd tank sizes. For example, I've seen 50 gallon fresh, but only 20 gallons each of black/grey. Keep in mind that the fresh capacity listed by the manufacturer includes the 6 gallons of the water heater; which I consider cheating.
- check all doors and windows.
- get underneath. Look for signs of something being scraped, and for axles being bent. Trailer that old, ask when the last time the bearings were done.
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