Ralph Cramden wrote:
Fill it up, drop the under liner, how much is the tank sagging down? Possibly about 30 gallons worth of sag in the middle? Sounds like a lot however. Better than laying on the highway I suppose.
A sagging tank and an incorrectly placed pump draw were the 2 issues I had with my Coachmen Freedom Express, a Forest River company. The fix was easy - moved the pump draw down to the drain port on the bottom of the tank and installed a steel beams to better support the tank & prevent it from sagging when full. Mine's a 2014 model but AFAIK the new 2018s still lack the proper support. Pics
start here.