So i decided on getting this temperature controller outlet to use with my oil filled heater. Thank you everyone for all your help figuring this problem out.
I'll give an update after I've used it for a while.
I insulated my trailer and put 2 patron 1500 watt heaters with temp control on different circuits from the house for redundancy. One will keep up usually. I also just let the truck mount run as I drive between jobs. Open a side trailer vent so the vacuum doesn’t suck the sides of the trailer in. Has worked for 4 winters in South Dakota now.
So i finally got to try out my heat setup using the Bayite temperature control outlet and oil filled heater.
It was 31° last night and i had the temperature outlet controller set to turn the heater on at 45° and turn off at 55°. I started the heater around 9 pm it finally hit 55° sometime around 4 am and shut the heater off. The temperature has since only dropped to 50° and now is going up because of the sun.
This is going to save me alot of money by the end of the winter.