Our first Wally Docking experience was this past February, in West Virginia, when it was 10 degrees F. on our way to sunny Texas. We called in advance for permission/instructions and arrived at the Super Center about 11pm, parking where they requested, then I waved at a passing police cruiser going by at 11:15. It was a pretty level spot. I left no exterior clues that we were over-nighting, including the stairs.
The furnace did fine for a few hours, but I think the cold temps reduced the pressure in the LP tanks or they froze or something. Plus, I hadn't considered insulating the one single-pane window in the coach, which is in our overcab bunk area. We woke up freezing about 4am, I put another sleeping bag over us and we toughed it out. Then, about 5:30am, the parking lot sweeper decided it was the Indy 500 and our rig was the infield. I think he did about 25 or 30 laps around us. I'm certain it was just to mess with us. I guess a guy driving a sweeper at 5:30am when it's 10 degrees has to get their jollies somehow. About 7am, we left. I was happy to have had a place to get a few hours of rest, and it was kinda funny how aggravated the Better Half got at the sweeper. She's always nice. I tried to pretend it was Mom's vacuum cleaner and went to sleep.
I'd do it again. I might have some different equipment, though.