I checked on the camper yesterday and found that the JoyRider installation was going painfully.
First, a hard propane line was in the way on one side. They had to plan for re-routing it around that area.
Second, with an I-beam frame, the holes drilled in the brackets would have meant that the corresponding holes in the frame wouldn't line up. They ended up having to weld the brackets in place.
Third, the original u-bolts weren't nearly long enough, so they had to replace those.
And finally, the installation instructions call for 14" of uncompressed space in the shock (or something). One of 4 made it to 13 3/4"; the remainder were low 13s or in the 12s. I think the last discussion was drilling a new hole in the bracket or something.