Yes yes and yes, the axle movement vs the arm we actually had to resdesign the linkage to the axle to prevent the arm from flipping back past 90 degrees, this took a couple of tries to get right. There are several benefits to running this, the main being the moment of interia is at the back of the short wheelbase truck, this results in a more stable feeling rig at speed, the weight is spread more evenly as well so when it’s loaded down the rear does not squat as much as it would with a traditional trailing arm. The other benefit is the shocks are behind the seat(duh) and the shocks never see any side loading because the arm is fixed horizontally with a unit bearing. There is a 4 inch tube and long side plates, with the subframe for the shocks to mount all tying in the rear frame, that part of the frame does not flex now. We are building the crossmember for the links and caging the back for KOH because we saw substantial flex from the stock frame. The long 48 inch links with the single triangulation was not enough to maintain the axle position reliably, it might be better with a 3 link but with 4 links there is only so much room and with this much travel the arms need to be as long as possible.
