I would get a new water hose, new sewer hose, they age also. you know about tires, and the anode rod in the water heater. Since you don't know if it was winterized properly, put water on it, and check for leaks. Don't forget to check all the traps, even the one under the shower, (pull access panel and use a flashlight). Fill the propane tanks, and check furnace, stove, water heater. If water heater is electric, test that also. check fridge, gas and electric operation. Roll out the awning and inspect operation, look for tears or holes in fabric.
Better suggestion, find PDI checklist on here, and check it all. Know you aren't getting a warranty, but I would check everything before I signed the check. Then is something is wrong, can renegotiate price as to who is going to pay for the repair.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT