I am loking at a Winnebago, I think it is a Class B. It has a Renault engine. It is a mid 80's with 35,000 miles. It is in excellent condition. It has a little cieling rot above the shower, I believe because of inadequate ventilation, and the cab air conditioning needs to be charged. I think it needs a hot water heater also. I don't know much about these, so I thought I would write here to get some input. Is ther anything I should pay attention to when looking it over? Is $3500.00 a good price? How much would a water heater cost?