Ah, I now better understand your challenge.
My springs just slipped off those domed steel bottoms with the milky-colored polymer collars around the bases. I wonder why there is such a difference between yours and mine.
I am glad you managed to get it done. Now off to find a truck tire & alignment shop. Cassidy Tire in my area services 18 wheelers. They were able to take good care of our PC alignment.
If you have an aftermarket steering stabilizer like our Safe-T-Plus, make sure to tell the alignment technician that he must loosen it from the steering linkage, then retighten after the alignment is complete. My alignment guy could not get the steering wheel to point straight in a relaxed state until after we figured out that the Safe-T-Plus was the culprit.
BTW: I added my trip report evaluation to my initial post here.