I may have some important info to share. I wanted new bed hardware to mount this bed. Prices vary wildly online. Anywhere from $26 to $56 or more. The cheap stuff has mixed reviews, some saying the hex socket heads strip out easy. I didn't want to chance that. I don't mind regular hex head bolts. The nuts are the difficult part. Unless you have a helper, you really need those U-nuts so they stay in place and can't rotate while you tighten the bolt from above.
So I went to a local hardware distributor today that specializes in automotive stuff. He couldn't find M12x1.75 U-nuts in the catalog. So I came home and did some digging. I found J-nuts. They are like U-nuts, except the clip part that wraps around the edge of the frame is short. That shouldn't matter. As long as there is something to catch the frame and keep the nut in place.
Auveco part #23784, around $10-$11 for a box of 10 pieces. I'm going to call my local guy tomorrow and see if he has those or can get them. That way I don't have to pay an extra $10 for shipping. Regular hex head bolts (grade 8.8) are around $2 - $2.50 each for the sizes needed. So a complete set of bed hardware will only be around $25 plus tax locally supplied.
Part of the reason this is important to me is that I am adding an extra set of bolts for the new bed. It will have 8 bolts instead of 6. And ordering a set from Rockauto or LMC Truck only gets me a set of 6. Then I would need extra parts.