Bed rail size?

Sounds good, post some pics if you get it done.
We're all very like minded individuals here in TW, most of us are very crafty and come up with good solutions.

 

That's why I love aluminum.
People just need to be mindful not to cross thread onto aluminum T-nuts.
It's relatively easy to cross thread aluminum t-nuts, the engaging should be smooth if anything feels funny STOP, back out the screw and try again.

 

Random question about the t-nuts...

What size, if any, aluminum extrusion bar shares the same size t-nut as the Tacoma bed bars?

I’m trying to make some things out of aluminum extrusion and would like if they were the same size so I could swap parts between the extrusion and the SEB rails.

 

Aluminum does corode when using stainless bolts. Aluminum bolts are hard to source and strip easily.

I would recommend stainless. The black oxide rust a d the rust will leave ugly orange stains

 

What are the black colored bolts?

 

Steel or black oxide steel I believe

 

Black Oxide

You're correct aluminum does corrode but from my experience it's more apparent when a fresh cut or sanding is done and it's exposed to weather elements (rain, moisture, snow).
Aluminum corrosion is not as bad as rust from steel even if it's coated (black oxide).
I forgot to mention this important detail about aluminum corrosion, thank you sir.