I am considering purchasing a 2001 Sunnybrook TT. It doesn't have a covered under-belly. Has anyone ever done a retrofit and installed a covering for the under-belly and added tank heaters. How hard would it be. This TT is in pristine condition, one owner. 27ft., one owner. They have ever used the stove or oven or cooked inside. Probably no more than 4,000 miles towed. It will need new propane tanks, tires and bearing pack. I will be using it for cold weather hunting. $4500.