Bdogz, the step area is lined with thin steel plate outriggers which are welded to the main frame. These plates have long curved slots in them to accomodate the lugs on either side of the steps, which slide in these slots when they are lowered. These outriggers can rust through water and salt, or be subject to electrolytic corrosion where the aluminum skin is in contact with the steel outriggers. Also, the locking holes at the end of the slots can wear, leading to partial collapse of the steps. Repairs in this area would be time-consuming, and would need a skilled welder, and great care to avoid setting fire to the floor. I hope this helps. Nick.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."