I got an insulated truck body with an aluminum floor. It used to have a refrigeration unit on it, so is well insulated on all sides. Side doors and full back door. It will be my 50lb sulcata winter home. It’s 24’ long and I can put a partition in so as not to heat the whole thing. I intend on heating it with a propane ventless wall mounted unit. Would there be any concerns in this type of heat?