Building a TTT with galley in front, and planning another, ditto, I put the AC in the rear where water wasn't blown into it when driving so it didn't need a cover.
It was positioned where it might blow on the heads of anyone sitting on the couch, so I bought a Haier 5K BTU unit that has the air outlets that blow UP and OUT. You might consider that factor in a TD. Having one blow air up toward the ceiling rather than directly over you while sleeping in it might be preferable.
The PT will be too low to mount on in the rear, so I'm putting a mount in the side with an outside cover. The AC will sit on the floor for travel and put in the mount for use, pushing the cover up as it slides in (after unlocking the cover that is).