Reese Universal Base Rails - Questions on installation

The sheet metal on the bed floor also carries weight and transfers weight down through the hat channels under the bed.

The Andersen Ultimate gooseneck version and the B&W companion do the same thing. They transfer weight through the bed to the frame.

4 bolts with the brackets is enough to tie the rails to the frame...

The bed of the truck transfers some of the weight down. That's why there are spacers to keep the bed corrugations from being crushed.

Thanks!

Jeremiah