Are we over thinking insulation

[Gulfcoast]

I have one inch of Polyiso insulation in the walls and two inches in the ceiling, but my best purchase was a Dickinson (vented outside) propane heater. Now I have way more heat that I need.

[onehoser]

in the ceiling i went with 1” polyiso board between the joists, then another 1” overtop the joists as a thermal break. in the walls i installed 1” of polyiso between the studs then a 1/2” layer overtop. i plan to insulate under the floor once wiring etc is done, for now i have 1/2” interlocking workout mat on the floor, very nice on the feet and has sound deadening properties
it’s finally cold enough (0 deg c) for my 2kw chinese diesel heater to work properly without overheating the trailer, lol