I've researched the available options & other ideas I've had. I decided to use some SS strap eye anchors. I came up with a dozen from a marine consignment source. They take #10 fasteners & will fit on the inside edge of the bed between stake pockets. I think these will be a useful addition for light loads.

You got any pics? The stock ones are almost worthless so I'd like to get some ideas.

These are SS but obiviously thin & will bend if over stressed. 2 were already bent. I got 16 so can install down both sides every foot. I have 2 of cast bronze screwed down on top of the bed behind the cab. The cast brz have not bent in 10 years & I don't believe they will but I couldn't find the in brz at the Marine Consignment. (Pd less than $1 ea/used.) The bed interior & fender come together & welded in this area... the strap eyes will bend before the fender.

I wouldn't load those up too much without a decent backing plate, but that's not a bad idea otherwise.