Full Timers with Cats
Have you made sure the 2 cats enjoy (or at least tolerate) travel? Ours like it (particularly lying on the dashboard in the sun), but they grew up travelling. Cats are by nature territorial, which causes some to travel very poorly indeed.
When travelling, ours ride in the truck, then transfer to the trailer when stopped (they always wear harnesses with leashes). I suppose they could ride in the trailer, but I fear the ride could be pretty rough for them.
For answer to your questions, see my response to your other post.