Graphics fade and crack in the sun. Tires that are not kept covered get cracks in sidewalls and may need replacing for your safety at around 4 years old. A set of six tires costs over $1200. Look for any evidence of water leaks inside, expensive to repair. If you find what you want, have a pro truck service inspect and give you written estimates for any repairs/replacements needed.
Make sure that all appliances dash and roof AC and RV generator work properly and if not, get written estimates. Don't buy on impulse or "tired of looking".
Don't buy extended warranty, set monies aside for maintenance and repairs as needed. Roof AC, fridge, converter/charger and batteries and fresh water pump may need replacement when about 10 years old (Our experience!)