Matthew,
Yessir, you can use either boat as a camper, I have a P22 and would not hesitate to trailer it and say aboard in a campground. There are a couple of issues -- the P22 sits high on the trailer (it's a big boat), so one has to be able to climb into it. Some of us are more horizontally challenged than others and this could be a concern, but a boarding ladder would help. The other is the folding masts. Even though the hatch is designed off center, both masts go across the hatch when folded, blocking around one third of the opening. As the builder, you will be accustomed to climbing in and out and this will be a non-issue, but anyone else in your party may have a problem for a while.
The weight location on the trailer is also not an issue. The P22 is designed to sit on it's keel while on a trailer. Trailer bunks merely balance the load. I recently had my grandson visit for a week (5 weeks old at the time) and I had the chest cold from hell at the same time. In order to not infect this child and incur the wrath of God any another people in the house, I spent 7 days sleeping in my P22 while it was on the trailer and under a shelter in my back yard. Comfortable bunk, pottie, locally rigged air conditioning using convenient shore power -- what else could you want?
Tony