Im wondering....did you put anything underneath the ORFAB sliders or is that a bead of sealer put on after to keep moisture out??
Before remounting the sliders I applied a protective rubberized vinyl piece to each side of the lower tub. Its a thicker rubberized adhesive material that is cut to fit the contours of the bottom of the tub and it should help to keep moisture, salt etc from getting between the slider and the tub and causing corrosion. You can find them for sale at Extreme Terrain and I was happy with using them for the intended purpose.
https://www.extremeterrain.com/barricade-body-decal-tj-j100946.html