Well, I wanted to mount mine flat to the bedside in such a manner that I could lock it up, it wouldn't rattle, and was relatively easy to put in and remove. The locking part is easy, just drill a hole in the threaded rod/bolt and put a small padlock through it.
So I bought their kit because it looked like it'd work beautifully even though it looked like it wasn't meant to be mounted on flat surfaces. Well, it definitely isn't meant to be mounted on flat surfaces--or at least not so the bar is parallel to the mounting surface and all the hardware. It's pretty disappointing. What kind of retard would want to mount their jack so it stuck up above the bedrails anyway?
So, I started looking at it a bit closer. The hardware is like grade 1, they used these stamped start washers for lock washers, didn't give you any flat washers to prevent the sheetmetal you mount to from distorting, didn't clean the threads for the wing nut after drilling and painting, the padlock is so crappy that you could cut it with a pair of side cutters if you didn't drill it out with a 6v cordless drill, and the hinge pin is a piece of safety wire that you can easily pull out if you don't want to deal with the padlock.
Anyway, the moral of the story is spend your money elsewhere.
So that still leaves me trying to find a way that I can mount the base of the jack off the right rear bed pillar and run the bar between the wheelwell and the stake pocket. I'd then cut the handle shorter (few inches) so it barely fit between the stake pocket and the jack base. I'm going to try to figure out something I can make that mounts off the stake pocket that I can build with my rudimentary tools. I want to keep it pretty low-profile so it doesn't affect bed use too much.
What you did is exactly what I plan to do with the trail rig.