mosseater wrote:
As you sound like you know what you're talking about, I assume you understand there is a locating pin which allows very little movement of the axle independant of the perch. Where the spring meets the shackle, so follows the axle within +/- 1/16" per perch. And that's before you retighten the u-bolts. Creep is sure to follow, given manufacturing tolerances. Nothing Lippert makes will ever fly on the shuttle. Just an observation..
When my axle was 3/8" out of parallel...after having springs replaced...the alignment shop was able to move one end of the axle back 3/16", and the other end forward by 3/16". I remember commenting to the tech, "I am surprised you have enough clearance on the locating pin to make that much of a change." He said, Oh yeah there is plenty of clearance. Those holes are quite a bit oversized around the pins. They have to be for making accurate adjustments needed due to the stack up of tolerance when everything is mounted up in manufacturing." Maybe my trailer was different than most. But his reasoning made good sense to me.
I assume the OP's original axles were located correctly at one point. But at some point, for some reason, he needed them replaced. And they did not replace them in the exact same position. So a simple adjustment could be made to get them to that original location.
My line of thinking is that if all was right at first, there should be no need to cut and re-locate spring hangers now. UNLESS his spring hangers were somehow damaged over time.
He can do all the measuring he wants to. But he knows his tires are not wearing evenly. So he knows he has a problem. He also knows he has had new axles installed. And he knows they did not align them. I see no reason, to expect the spring hangers are mis-located. They could be. But I would be concerned if he has them relocated, then he might find the problem gets worse. Because then all he knows is his spring hangers are in the right place. But has no idea where his wheels are located, in relation to his ball socket. And it is that location that gives you tire wear. Along with off camber position. All other component measurements are for reference only.
Unless I missed it, I don't recall the age or general condition of the OP's trailer. Could be some things we don't know about.