Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us.
As to your questions, here are the primary things to look at.
1- Check the outside for any damage or corrosion.
2- Examine the interior for damage and excessive wear.
3- Ask for a demonstration of all of the systems. These include the air conditioner/heat pump, gas furnace, refrigerator, water heater, electrical system, converter, stove/oven, and the water system including the water pump.
4- Check the tires and brakes. Keep in mind that the tires (if OEM) are about 5 years old already, and will need to be replaced in the next year or two, regardless of mileage.
5- Review the sellers maintenance records.
Good luck, Brian
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)