Agree with fab51 about the u-joint. In my opinion the u-joint in the TT set up ia weak point. The four 1/4" bolts that hold the joint together take a lot of punishment. The ball housing has to be set up just right so that there is no excessive play which would cause the u-joint to hit the housing (you will see heavy scoring) or if it is too tight the u-joint will not flex and could break. In the manual there is no specific specification for determining too tight or too loose. It is a matter of feel. Nevertheless as hot rod lincoln rightfully says, there are pros and cons to both!
