We just finished building a bike rack for the TT. Not many good choices except the Arvika which has a poor website for specs and a really high price. Another option was the Trailer Tray / Bike Bunk but it was pretty pricey for what you get.
Decided, based on an idea from this forum to build our own. We just finished and took it for a short trip to test potential turning problems out and are very pleased.
Purchased the metal bike rack carriers off Amazon and built the rest from 2x4s and 3/4 plywood. It is very stable and can be lifted off the trailer frame and reinstalled without much trouble. Got less than $125.00 ( including the metal racks ) in it not counting my time and effort :).
Trying to post some pics.