To address the original question, in general, I don't like the 3" lift, which makes the vehicle less capable, and I don't like the RTT either. High center of gravity + minimum down travel = decreased stability. And the rear differential is still where that of a stock one is.
For the Alpine Loop specifically, there are three components:
--Corkscrew--Hurricane--California were in very smooth condition earlier in July and they are normally very smooth. I don't recall low hanging branches on Corkscrew (at start, everything else is above tree line).
--Engineer and Cinnamon are rockier but there is nothing really off-camber and they are above tree line. The lower portions are dirt roads.
--Mineral Creek is the rockiest trail in the entire area not counting P gulch. It does have a couple of off-camber spots where a 3" lifted 4R with a RTT is not something I would enjoy driving.
There are some tippy spots on Black Bear one of which is unavoidable as well as a couple of milder ones on Imogene. I would much rather drive a 100% stock 4R on those trails than a 4R with a 3" lift and an RTT.