Reformed Toy Hauler member here. Your expertise needed

Double door refer is hard to find in that length. That was on my list, but was sacrificed for other features. You should also look at Tiffin or Newmar in addition to Winnebago/Itasca. You will not find a gasser that will be able to tow more than 5,000 pounds with a tongue rating of 500 pounds. Not sure what size box trailer you will be towing.

Good luck.