New to researching Rvs

Sounds like you will not be able to do much work replacing or upgrading things so I would recommend you buy a rig no older than 4 years old with evertything working properly. Tires need to be replaced for safety every 4-5 years according to date codes on tires, appearance or tread depth means nothing. Tires become unsafe just sitting parked for long periods. Roof air conditioning units, refrigerators, furnaces, water heaters, house batteries and converter/chargers may go for ten years before needing replacements or overhaul. Do not buy any rig with water leak damage, look for any ceiling stains or mold odors, bubbling of wall covering, etc. Ford E-450 V-10 engines and transmissions can be in good condition at 70K miles. Average miles driven per year for RV's is 5000 miles. Brakes and engine cooling systems may need service/repairs, important for driving on grades. Have brake fluid changed every 2 years. Most brands have the same van front end, same brands of appliances and other "house" box hardware and electrical stuff. Major differences are in types of roof materials and quality of cabinetry and installation, interior fabrics, etc. You will want a rear bedroom with RV queen size bed. Other sleeping accomodations require setup and takedown or sleeping in the overhead bed which may not agree with adults with arthritis or claustrophobia.Learn as much as you can about RV lengths, floor plans, and sleeping accomodations and prices including total cost of ownership, cost of fuel and RV park accomodations and incidentals.Try to buy a popular name brand of RV. Most are of comparable overall quality and reliabilty, a few are better, and some are worse. Take your time and learn, don't buy on impulse or getting tired of looking.