Well, came to a bit of a complication... In my research on both the Truma Air and the Pioneer under bench units, it turns out they are designed to be vented through the floor while the location I was looking at, it has to vent out the side. There technically is enough space I think to put together some sort of ductwork to achieve what is needed but that makes installation way more complicated than I am necessarily looking for. It isn't that I couldn't do it but I am not sure I want to modify the camper that much just for my kicks and giggles project.
in light of this development, I have a few options...
1. Abandon the project entirely and stick with a new roof top AC unit (what is the fun and learning in that)?...
2. Keep searching for a unit that vents out the side like I need.
3. Modify my bench to allow for ducting to make the Truma Air or Pinoeer work as required.
4. Build my own AC unit for exactly what I want and then create a company and sell it to truck camper builders.
I have the skills and resources to tackle step 4 but not necessarily the bandwidth (I already have a few businesses I'm running). Unless there is an option I have not found, I am surprised there isn't an AC/Heater heat pump designed specifically for the truck camper market.
It is going to take some thinking on this to see where I want to go.
