RTTs on the vehicle are way high on the cool factor. Here in North America though, just how practical are they? For some, especially out west, IF you are constantly on the move, they fit the need very well. If you are NOT constantly on the move, and prefer to set up a basecamp and explore from your basecamp for multiple days, then an RTT on your vehicle easily becomes a major PITA. An RTT on a trailer? Just my humble opinion here, but those offroad trailers can get really expensive really quickly and getting the tent up high enough really effects the center of gravity. I'd much rather build my own trailer, ( as we did, check out my walk arounds in the trailer section ) get an excellent ground tent, ( as we did ) and save 5 or 6 thousand dollars so we can actually get a bit of overlanding in. If money is no object, then have at it with one of the many expo trailers on the flooded market today. good luck. !!