gordon, your not giving us to much to go on as to model of coach ,# of slides,wood floor,etc,etc. I would get as much info as possible from previous owner if possible.
Should check roof for starters, look inside for stains on ceiling an inside cabinets. Check sealents around outside of coach. See if slides shut tight an stright into recess seals of coach and locking bars work properly. You should have a bar supplied to do this.
If there a maintinance records good thing, front engine maybe noisey but kits to cut down noise availible. Should give good miles.
Wear and tear should be minor if kept up by previous owner.
Check for seals around furnace and refer outside wall, I had coach with a leak at this point caused slite buckling of wood floor, that dealer never found cause. You can get work done at Newmar repair center if need be at a cut rate JAN-MARCH. Have owned three Newmars you can't go wrong if coach has been taken of. May come up with more if you post info.
"007"
Linear Mode
