You know mine came with the inside jack posts and the dealer said no one used them, that they are "there as protection to keep the slide from going out while driving". I didn't see how that could happen with the drive mechanism that the slide uses....BUT I never thought they also keep the slide in contact with the frame! Haven't had a slide leak yet, but I kinda agree with the caution that too much compression will also cause future problems.
Those of you that heard of my leak, I think I fixed it. I had a leak in my 235S that was showing up as a damp carpet in the forward storage box under the dinette behind the passenger seat and sometimes extending to a damp carpet immediately behind the passenger seat. I sealed the lip where the body parts come together, I sealed all the windows and passenger side screw holes to no avail. Finally a tip from Gary made me look at the TV antenna. The hole where the antenna entered the body through the rubber roof looked like the cable connector could move up and down allowing some rain into the cavity. The slope of the roof allowed the water to roll down between the wall and outside wall and apparently exited into the carpet at the flooring level. A tube of RV Goop sealed the hole and sealed the boot cover into place. I think I have it beaten for the time being.
Moral of the story is that the water doesn't always come from the obvious place.