Heater recommendation for 30-amp site

[Wayne and Carolyn Mathews]

We are living in an older KOA park in Dillon, Montana, where there's only one 30-amp connection per site. When we lived in our rig through a bitterly cold winter 4 years ago (30 to 40 below temperatures fairly regularly), we also had a 50-amp connection where we were parked on our land. Now we're living with a "turn off this if you're going to turn on that" situation because of the 30-amp connection.

It's cold--we've already seen several 9 - 16 degree nights--and we need a bit of extra heat for our living area. (Yes, the trailer is already skirted.) We've seen a few space heaters that can be run on low, using slightly fewer than 15 amps, but we're wondering if we're missing some heaters somewhere that would work better for us than others. And, should we be looking at the oil-filled radiator heaters rather than the heaters with fans? We do have a fireplace that puts out a tiny bit of heat, but it also eats up the amps without much of a return.

After being so comfortable in our trailer through a Montana winter 4 years ago when we had a reliable 50-amp hookup, living this winter on a 30-amp circuit is going to be more of a challenge. If you have a recommendation for a heater that might work better for us than what we've seen so far, we'd sure like to have your opinion.

Carolyn