Thanks for the post skipperted
Unfortunately under floor heating is not an option. One objective for this camper is simplicity to increase reliability, and limiting the number of systems on-board is my way of doing it.
Thanks for the suggestion though. It is a good one, and one I had actually considered early on. Although, I HAVE considered one of these to run off shore power when parked...
I doubt Ill go that route though. A pad like that under a wood floor just doesnt seem like a good idea

Plus, they are designed to heat soak a ceramic or concrete floor to hold heat.
Do you have any photos of your rig? Id love to see another steel/wood camper!
