Great idea...I think
So, I am not one for being cold and I like "free" heat. Here is my idea. I am going to install a jacket water heater for a small diesel engine somewhere on the underside of my camper, run some copper pipes alone the floor and recirculate it through. Houses have it right? So why not my camper! Anyone done this? I will post some pictures of my drawings.
2006 Chevy Trailblazer EXT
2007 Flagstaff MH19TH
It's me my wife, 4 kids and our Dani Dog