For those of you who might be following this thread -
I ended up ordering 4 rollers from Amazon (I already had one incorrectly installed).
I was trolling through Youtube and came across a video from #loveyourrv.
I was a bit astounded to find out the entire slide is riding on two pieces of curved plastic in the corners.
I used some 1/4" plywood shims, and lifted the slide up off the plastic using my floor jack and some 2x4'. I mounted the rollers so that there is one in each corner and split the rest of them evenly out across the slide.
I also dropped the drive slide drive assembly out, and lubricated the gears in the motor head (there is no way to grease the actual jack screw assembly without diving way deep to disassemble the unit).
The good news is the slide now works as well as it did the day I bought the rig.
Now for the question that's burning in my mind. I used self tapping outdoor (coated to resist rust) screws with stainless steel lock washers. As much as I'm thrilled with my work, the steel tube under the 5er is maybe 3/32" thick - and I suspect over time, those sheet metal screws will start to bend and/or lose their grip.
The best solution would be to weld nuts to the tube - and use some stainless screws to hold the roller assemblies to the frame.
Since i'm going to be redoing the floor of the slide, I will have the opportunity to put some rollers embedded in the leading edge of the slide on the inside. From what I can tell, it may damage a new vinyl floor I'm considering putting into the trailer, shortly.
Just from a practical perspective, has anybody found the slide will mar the new floor or is the solution to put down those "slides" that you put inside on the floor?