Thanks for the pics!
I bought both the largest set of airlift 1000 and the ram set of 1000hd. I am finally home to check them out. With the Geiser springs, neither seems to make perfect sense, but maybe I'm wrong. The 1000 set has enough diameter to contact the whole coil but is not near tall enough, and the 1000hd set is almost tall enough to go from seat to seat. My truck in on a sloped driveway so it's probably compressed in the rear a bit, but the distance between seats is about 13," and the 1000hd is about 12" tall, so an inch to spare in there when there is no air in the bag.
Does the 1000hd get much taller when aired up? I don't remember if the stock springs had something in there for the bags to sit on, with the Geisers in there, it seems like the seats have a hard edge that may pop the bags.
Lastly, did you have to drop the springs out or were you able to squeeze them in through the side of the coil?