So Here was the nest,
View attachment 1376148
Got a basic 12v heating blanket from wally world, put it under the fitted sheet on the air matress. The bed was layered as such, air mattress, heating blanket, fitted sheet, regular sheet, comforter. I Hardwired the blanket into a slot in the rear fuse panel (power is always on to the rear panel) and turned it on early. It did a great job.
The bed was warm all night long. It was about 20 degrees outside +/- and we were exposed to rig shaking wind for most of the night. We did pull an additional top blanket over us at about 4AM but otherwise we were incredibly comfortable.
The blanket was rated at 3-4amp draw. The battery started at 12.8v (9:15 PM) and when we woke up it was at 11.3 volts (8:30 AM). The rig started on the main battery, I didn't even have to link the aux battery. I was thoroughly impressed.
Very impressive! I thought a heated blanket would pull more amps. Nice to know info.