@ choprzrul, Exactly!
I've seen that particular combo in pics before. Yours? I think that it is KA based.
With a steel deck the deck is actively working against your insulation attempt. It's a thermal transmiter drawing the heat out of any hot spot. An inch of plywood over a steel deck wouldn't be enough for me in the really cold country some of y'all hunt in.
Get a long enough goose and you can pull the boat and it's trailer up onto the rear of the goose behind the camper.
Or, in some States can tow double with a non-Commercial Class A. Some supposedly require that the first be a goose or a 5th, others don't, and there's some dispute that any actually do.