On older models like my '04, they just used flat steel straps and over time the plywood would bow and the straps would come loose. I had to replace the bowed plywood. Also replaced the three straps with 3/4" square steel tubing screwed into the cross members. But I used like 6 or 7 on roughly 16" centers rather than just 3. All of this was above the bottom of the I-beams and completely covered by the black membrane.
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Larry Day
Texas Baptist Men-Retiree Builders member since '01
13 Silverado 3500HD D/A, 2wd CCSB srw, custom RKI bed
11 Cruiser CF32MK
https://www.picturetrail.com/dayle1
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