For next winter you should buy one of those heaters they diesel or kerosene and 12v power they have exhaust so there no exhaust inside the garage or trailer I have this on my garage and this works great produce same heat as 220 volts 5 kilowatts electric garage heater and they cost about $200 on eBay this could be rv or other use I’m using 3s Lipo or 12 power supply to power.