Looking to purchase a used Class C

You will want at least a 27 foot bumper to bumper rig. If you buy used, try to find one 3-4 years old with everything working, no evidence of water leaks and new OEM tires by date codes. Have brake fluid flushed and brake system serviced as needed. Get independent estimates for any repairs needed or upgrades wanted. Slides are nice but some interfere with access to things when retracted and they can have water leaks and mechanical problems. The fridge, roof A/C unit, fresh water pump, converter charger and house batteries on our rig needed replacement at about 10 years old. Yours may last longer or not. If you buy new, check the dealer's reputation for quick and professional after sale warranty fixes. You can dicker for substantial price cuts on new rigs especially if you can buy for cash. Spend time in rigs and pretend eating, sleeping, making the bed, using the restroom and galley, watching TV, etc. Don't buy on impulse and find a floor plan and features that best suits your needs/desires. Don't buy an extended mechanical warranty policy, save money in a pearl harbor bank account instead. Don't buy a really old rig that with carbureted engine, inadequate engine cooling system and history of poor DIY repairs, and tires that look new but are ready to blow. If you have RV body repair, electrical, truck mechanic, air conditioning, plumbing and gas appliance repair skills, and time, work space, and available help you might save about 1/2 the cost of getting an old rig ready for cross country touring in safety and comfort. Old rigs sell for around $5000K regardless of how much money you put into them in repairs and upgrades.