FOUND!!!!!!!!!!! [Our travel trailer was stolen.]

I really hope they find your TT. If I was going to guess, I would think it's not going to be used as a travel trailer and is probably already set up where it will be used.
It's very hard to stop a thief, all you can do is slow them down. Chain the tires, remove the control cable, disable the tongue jack, remove the tongue. The GPS idea is a good one.
With everybody looking it will probably be found.