Buy low, sell high and don't run with scissors....
Placed my outdoor thermometer sender in the white plastic cover for the propane tanks. Even in the sun, it gives a pretty accurate temp reading.
Added an 120V outlet in the trailer that has it's own plug under the trailer that I run a (good quality ) extension cord to CG pedestal to utilize the separate 20A outlet ( when the pedestal has one ). I run my small electric heater ( 350W/700W ) on this outlet, bypassing the 30A power center in the trailer itself.