We use these two items in our parked at home 5th wheel and OFF-ROAD POPUP camper for heat when the temp gets down. Both trailers are winterized using the BLOW OUT METHOD.
This is a THERMO CUBE that has three or four different temp models. We use the 35 DEGREE MODEL. Also have a 45 DEGREE MODEL as well... This comes on when the temp drops to 35 degrees inside the trailer. When it warms up in the day it turns off. You can use 100WATT lights bulbs or plug-in a heater into the 15AMP socket. Work great for us
This is the low profile oil filled heater we use set to a #3 setting with one heat zone selected. NO NOISE-NO OPEN FLAME-NO BURNT DUST SMELL... Very safe for us to use in an unoccupied situation.. Don't have to worry about setting a run-about mouse on fire or burn up a blowing curtain...
Both items available from AMAZON
Roy Ken