Do you have room to slide a drawer in there, or will the sink be in the way? I have a 19H and my wife wanted a different faucet, so I took out the panels in front of the sink near the outlet to look in there, and the sink comes pretty far down.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.