HI all... I have looked at the Diesel units for heating the sleeping compartment and that would work for just heating the sleeping area, but I really don't want to carry a 3rd fuel (LP, Gas and Diesel)... Also would be nice to find a small heat pump that I could use for both cooling and heating and in a very compact format that could be hung off the back of the trailer... I suppose power consumption will be an issue but I have the little Honda generator so could use that... appreciate any ideas cheers