If you take the time to read through the stickies and repetitive threads with advice on buying new versus used, etc.,etc. it'll help you in shopping for and buying a "rig" that suits your needs and desires. Renting a rig to get the feel of driving ,operating and using an RV is a good idea. Driving a 22-24 foot Class C is not much different than driving a 27 footer, don't be over-awed by size. Short rigs have much less comfortable sleeping accommodations than medium length (27 foot) rigs. Many of us have owned a number of different rigs over time as our needs/desires change. My advice, buy a 27 footer with rear bedroom,
slides optional, 3-5 years old, new tires, good brakes, no mechanical problems, and all "housebox" electrical, appliances, generator, roof and dash AC,plumbing, etc, etc, working as determined by a thorough inspection by a pro truck mechanic and RV repair service. Buying cheap can turn out expensive. PS: get written estimates for parts and labor for any repairs/replacements/upgrades needed.