$12,000 is quite high because of all the money you would need to get it right. 2 rotted tires really means that 6 need to be replaced, generator repair could be at least $300 to 500, refrigerator over $1000, and if it has been off the road for a long time, brakes probably need work. The awning fabric replacement could be around $200. Should be test driven, but with at least 2 bad tires, I would be careful taking it on the highway. $12,000 would be a good price if all you needed was 6 new tires.