Propane stove for high altitude

Hello,
I am building a teardrop style trailer for hauling behind my 4 x 4 to be used both at civilized campgrounds and deep in the wilderness, The living space will be about 200 cu . Ft. I am seeking a propane space heater that will keep the cabin warm in inclement weather. From Minnesota, the cabin is being insulated adequately now. We are retired to 6,500 feet and I realize some propane units simply do not work efficiently this high. I also have found out some do not have a thermostat. With the insulation in winter, I am sure I will want to be adjusting the furnace for a long, safe winters' sleep; that is safe and comfortable.
I'd appreciate any insight so that I purchase only one type pf heater that is correct for the long term.
Thanks, in advance,
Gene So
I am building a teardrop style trailer for hauling behind my 4 x 4 to be used both at civilized campgrounds and deep in the wilderness, The living space will be about 200 cu . Ft. I am seeking a propane space heater that will keep the cabin warm in inclement weather. From Minnesota, the cabin is being insulated adequately now. We are retired to 6,500 feet and I realize some propane units simply do not work efficiently this high. I also have found out some do not have a thermostat. With the insulation in winter, I am sure I will want to be adjusting the furnace for a long, safe winters' sleep; that is safe and comfortable.
I'd appreciate any insight so that I purchase only one type pf heater that is correct for the long term.
Thanks, in advance,
Gene So