We have an Optiums oil filled heater. Is 25" high 13"wide by 5" and sits on 4 small wheels. Looks like a small steam heat radiator in older houses.
Has two switches on one end, one for 600 watts, the other for 900 watts; both can be on for a total of 1500 watts. We keep it across from the couch in the middle of our living area. Got it at Wally Mart for around $30.
Will keep the trailer warm down to about 50 degrees, below that the trailer central heat will come on. It has an adjustable thermostat to cut it on and off.
I also use this heater as a load for my generators when I run them once a month.
2012 Toyota Tundra 5.7 Litre DoubleCab
6 speed, 4.30 Limited Slip, Tow Package
2013 Jayco White Hawk 27DSRL
2010 Jayco JayFlight 26BH sold
Yamaha EF2000is Generators (2)
1996 Honda CB750 Nighthawk