I had my wife watch the trailer & cab while I backed up and was able to get to approximately 88 degrees. In the picture I posted, I was having to get in & out of the truck to monitor the clearance, so I didn't want to push it.
After testing, I was prepared to stay with the Andersen and sell my Pullrite slider, that is until I backed the trailer into my shop and attempted to close the door. The top of my shop's overhead door was bent/bowed and wouldn't close correctly.
Upon further examination, I found that the extra 2 1/2" that I needed to extend my front landing gear to connect the Andersen set-up (the Andersen Coupler mounts below the trailer pin box) caused my front air conditioner to contact and bend the door.
My shop originally had a 12' high opening but I was able to raise the opening up to 12'-7", install a limited head clearance overhead door track, add a small section of door panel, apply some vaseline and slide the 321 inside. This worked, hitching & unhitching the Pullrite, with about 3/4" of clearance between the AC and the raised door. Not so much with the Andersen.
I can't gain any clearance by repositioning the pin box or lowering the Andersen ball, since they're already in the optimum positions.
If you're in the market for a complete rail mount Andersen set-up, check out my ad in the Forum classifieds.