prairiecamper, I bought the Firestone Ride-Rites. they seem to be the most popular.
It took about 12 hours to mount all four, but I was taking my time, and also had to work around my fifth wheel mounting brackets, as they were in the way of where the top air bag support was supposed to go.
All things considered, it was pretty simple, and the hardware supplied with the kit works well.
At first I was going to tie the air lines together for the front and rear sets, but as they didn't supply a tee to do that, I plumbed all of the bags seperately. That is probably the better solution anyway, as that eliminates any transfer of air from side-to-side.
golfmedic, I noticed you only use 45 lbs of air in the back. That should provide a nice smooth ride.
I really am looking forward to trying them out!