With our last TT we also had a bottom mount coupler. In order for the bars to be parallel with the frame you can only use the last link. We ran the 2nd link down 90% of the time. Never made any difference. You just don't want the bar ends up so high near the frame that they could get in a bind on sharp turns.
I ran the 2nd link down because in order to get the right amount of transfer I had to have 6 washers in the EAZ-lift we were using. If I went with 7 washers and used the last link I had a devil of a time unhooking the coupler because it would bind up.
