Well good for you! This is not a complicated matter. Just metal, wood and plastics along with some fluids. So start with basics, from the ground up. You need to check from the sellers to see if they have service records. Then if so or not have the VIN run at Ford for recalls, service records and accident reports. You need to know if the soft elements are good, like tires, fan belts hoses, and suspension bushings, and brake pads. That's easy, they show signs of age by the way the feel and look. Then the hard stuff like tie rods, springs, shocks. Then the mechanical function like cylinder compression, transmission shifting, internal fluids, that tell stories of age by detecting the particles the have suspended in them as analyzed by looking at the separation of oils and water and heavy particles that settle out when the fluids are in a glass container. Only a sample needs to be looked at as it usually is representative of all of it. Then the roof must not leak or show signs of leaks as they cause mold and delamination to the walls. Then the "house" systems like heater, hot water, roof air(s), stove, toilet, entertainment systems. Then the water holding tanks from fresh to grey to black tanks and valves both in and out. Then electric for circuit breaker condition, as they do wear out and sometimes trip due to bad internal contacts. No problem, just like taking care of a baby that sometimes has gas and a tooth coming in and is in need of a bath and new diaper. It's your new baby, love it and it will smile back at you with all the fun you have. Congratulations, welcome to the gang.