Towing in Freezing Weather

I've done it, no so much to keep pipes from freezing, but to keep the rig at a reasonable temperature so I didn't freeze my arse off once I got to my destination and have it take all night to warm up the interior once I got to where I was going.

I would bet some of the class A motorhome folks run with the furnace heat on, because there's no way the dash heat will keep the cavernous interior warm while driving.