62 SB Step: Under Bed Tool Box Available?

[62ShortStep]

At some point in the near future I hope to relocate the spare tire from under the bed and move it to the rear fender. I'll then add a trailer hitch to the rear, but there will still be some available room back there.

I was thinking of adding an under-bed storage box. It would be tucked high so that it cant be seen. Attaching the box to the hitch supports would be nice so that no holes have to be added to the frame. Maybe the box can be made so that it folds down when its time to open it (so I don't have to reach too far to get in there).

I've seen some info about tool boxes under the bed that can be accessed from above the bed, but unless the access panel is completely hidden, I dont think I want to go that route.

Has someone seen or made a box like that?