Axle locations are supposed to be (SUPPOSED to be!) pretty close tolerances. I forget exactly, but no more than 1/16" out of parallel with each other, 1/8" out of diagonal from the tongue, and 1/16" out of lateral alignment. Unfortunately, most trailer mfg'ers don't get very close. To start with, the spring hangers need to be pretty close to exact location in order to even have a chance of getting the axles correct. Lipperts hanger location spec used to be within 1/2" diagonal all measurements, not sure what they go by now. IF you trailer isn't close to these measurements, it can probably benefit from a good alignment. Easy enough to measure and rule out poor mounting. Get a tape measure and a buddy and spend some time hashing it out.