Tentrax would be my top pick for a small tent trailer for the wrangler. There are several other brands out there though, Manley trailers, Sierra, Adventure Trailers, Conqueror, and the list keeps going. Or you could go for like a Pikes Peak trailer and add the RTT yourself. I would also look at the Lifetime tent trailers. Spacious and can be used a trailer to haul things and then put in the tent when you are there. Jumping Jack trailers are a similar idea to the Lifetime trailers.
According to the press release on that link the base Mopar trailer is $9,995 and the high model is $11,995 and that was for 2010.