My son-in-law and I used a BIG buddy heater for my Cow Moose hunt in the Snowy Range mountains here in Wyoming. We only used one of the two pads on the heater and it kept us toasty warm in my Un-Insulated 7x16 ft. Cargo trailer. I've got one on my short list, along with a Champion LP powered Generator. I sure liked that heater that he brought along!