Thanks for the additional comments.
Carl, the hole in the floor that my extension cord runs into is the hole that the big, heavy shore power cord snakes out of underneath the cupboard under the seat.
I didn't use that cord as it won't reach the deck outlet.
I went out there this morning to see what info was marked on the extension cord.
It was about 12 degrees. Talk about a frozen rope!!
I unplugged it and when the temps get back up in the 30's in a few days I'll look at it closely and probably put it in the garage and just run it out to the camper when I need it rather than leaving it out in the snow.
Or I'll fire up the propane
catalytic heater. It's just a tiny Coleman heater with a dish about 10" in diameter that runs off a one-pound propane
Doesn't put out a lot of heat but does take the edge off.