Compare Monaca and Holiday Rambler Endeavor

Thanks for replying. If the purchase would be a Diplomat or Endeavor in the years 03-07 would it need to update the chassis? If the purchase is a 03-07 unit will there be any built in problems such as chassis, electrical, or engine? Which years would more likely be most problem free. Which years are the engine a problem? Which engine gives the best fuel mileage? I will probably choose a 2003-07. Sorry I have so many questions.