This a common issue on my A128s. On my unit, I've found the easiest fix (besides cussing) is to drop stabilizer on the front driver side of the trailer - just the one stabilizer. Give it 1 1/2 extra cranks after a firm crank down. Set the walls (In my case, this alway aligns the pin.).
Finally, I set/reset all the the stabilizers to the correct pressure.
I've found that my pin won't align even when the unit is completely level. If you find that you have set up your unit correctly and the alignment is off then back off the rear passenger (door) side of the unit's stabilizer and add some tension to the front driver side.
I've speculated that my weight seems to warp the unit slightly.
(I would also guess that if the pin is aligned opposite of the way mine is aligned -- then reverse the process to see if you can get the same effect.)
Hope this helps.