There are several things to look out for when checking out motor homes.
A fiberglass roof is best. A rubber roof is worst.
Always look for leaks in the roof, push up on the ceiling panels. They should not have a lot of flex.
Look at the milage. Most MH's have low milage. Check the exhaust for blue smoke. Lsten to the engine run. look at the oil on the dipstick.
Try everything!!!! Refrig, heater, air condition, hot water heater, cook top, microwave, TV, fill the water tank and taste the water (FROM THE TANK) it can be hooked up to just supply water from a hose.
Diesel is best. higher milage and the torque you need on hills. My Diesel has 305HP. It will go over 80 mph, but I cruise at 65/70 MPH MOST OF THE TIME ON INTERSTATES. Since the base is a Ram 3500 beefed up to 12k# I can get service at most dodge/Ram dealers.
The seals shrink around windows and compartments. Just reseat them and fill the gap with black RTV (silicone) sealer.
Try out the layout. I got a booth setup. It converts to a bed in a pinch and you can eat there and use it as a work table. A nice bed is a great asset. Mine is a full queen.
The biggest problem accessories, of which I opted out on, are the roll out arming, and the slideouts.
They both breakdown at the wrong time and strand you.
NOW for the most overlooked thing. DRIVE it on the road and thru the city. If your heart flutters to much, look at something smaller. The biggest mistake is getting a castle instead of a motel size.
Hay, I started with a Grayhound conversion. Dropped down to an 18' Cruisemaster, then a 25' Scotty MH. (lost this in a fire when My home burned) My 22' turned out to be ideal.
The scotty and the Xplorer were both ordered with a diesel and 4 wheel drive. That 4 wheel drive saved my ass in both vehicles since I have driven down mild Jeep trails to prospect in AZ. and thru the wooded trails in the PA parks.
Just my thoughts, Frank...-
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