Horse trailer dressing room insulation

Eventually when I figure out what is going on the walls in the dressing room of the new trailer, I’ll insulate it and then do the final installation of hooks/bars/cabinets/etc.

Something showed up in a FB ad that I did not know existed… wool insulation, intended for vans:

https://havelockwool.com/van-insulation-products/

They specifically mention condensation as something inevitable that this helps with. I do remember being dripped on while sleeping in my non-insulated steel trailer before!

I’ve seen foam or styrofoam used. What other options are there especially if you’ve DIY’d them?

We’re experienced with spray foam insulation in building walls, but I can only imagine the mess trying to do that in the dressing room, plus I am not certain it would stick to the metal.

Check out the Horse Trailer Conversion site on FB. Tons of info on insulation.