Convert toyhauler garage to Office - Part 1 (planning)

We bought a toy hauler so we could make an office out of it.  So many people use the dining room table, or laptops on laps.  We each have two monitors, and use our computers a lot.  Besides, Cindy will probably work as a programmer from the RV at times.

So we have 8 feet 1 inch width, 13 feet length, of uninsulated garage, with a Happijac bed system.  We will use it as a guest room in the rare event that we have an overnight guest, but for the most part, the bed will be smushed against the ceiling and it will be an office (and, of course, a few other functions).

But we need to figure out the best way to convert a garage into a decent mobile office for two.

Easiest - put desks right on the garage floor as-is.  The problems with this are that it's cold, the floor looks like a garage floor, it's slippery, and the back 20 inches are unusable because they're the top part of the ramp for bringing toys like ATVs into the trailer.

Hardest - Build up the floor in the ramp area to reclaim those 20 inches, put insulating foam board on top of that, then plywood, then carpet.  The problem with this is that it's a lot of work, and also, since we are going to bolt the desks down, a lot of work in the future when we want to replace the carpet.  It possibly also voids the structural warranty, but Grand Design told us in an email that the warranty wouldn't be voided unless our changes are deemed to be the cause, and this seems unlikely.

Since we're going to be living in the RV, and we want it to be livable, we're going to do the harder, more complete option.  Our feet will thank us later.