Proper size and type of propane stove for teardrop

Hello,
While building my teardrop which is 5'5" wide, 9 deep and 5' high, as I am progressing to the point of laying out the carcase for drawers I want to enclose my heater in this structure, taking care of safety precautions. The heater given me has the wrong dimensions, being long and narrow, I would like the shape of "high and wide" and shallow as that shape would be much more suitable. So, given about 150 cubic feet of living space, which propane unit would you recommend? Being from Minnesota even though down in New Mexico, I would like to err on the warmer side.
Thanks,
Gene So
While building my teardrop which is 5'5" wide, 9 deep and 5' high, as I am progressing to the point of laying out the carcase for drawers I want to enclose my heater in this structure, taking care of safety precautions. The heater given me has the wrong dimensions, being long and narrow, I would like the shape of "high and wide" and shallow as that shape would be much more suitable. So, given about 150 cubic feet of living space, which propane unit would you recommend? Being from Minnesota even though down in New Mexico, I would like to err on the warmer side.
Thanks,
Gene So