If your friend isn't in a hurry to sell, try driving and camping in it to see if you really like the size and floor plan, and whether you and family will like motor homing long term.
Have you done homework about the various lengths and floor plans, that are available in various brands and year models? Appliances, AC units, , fresh water pumps, converter/chargers and batteries may need replacement or repairs when they're around 10 years old.
Tires at $300 apiece need replacing for safety when 5-6 years old regardless of tread depth/appearance. Insurance, registration, maintenance and storage costs should be considered when deciding whether motorhoming is a hobby/lifestyle for you and family.