You'll find that some of the RV manufacturers have ultralight versions of some of their more popular floorplans. We started looking at the Jayco 256RKS (we had good luck with our Jayco PUP and a good experience with the 'local' Jayco dealer), but found the build quality was not quite as good as its heavier counterpart, the 25RKS. We ended up with the heavier one, primarily because of the build quality, and secondarily because of the price. I think some of the mfrs use the ultralight label as a marketing tool to increase the MSRP a little.
Anyhoo, just a little food for thought. Keep an eye out for those things, and whatever TT you choose, it will be the right one for you.