Are you getting a fabricator to make the Al lid?
If so get them to weld a few lengths of solid material to the lower edge with a space between.
Counter bore the material for an 8mm pin.
Then on the trailer weld a matching steel solid block with 8mm hole.
Make up 8mm pins from stainless with Circlips to retain
Zerks on all fittings a squirt of grease will keep your dissimilar metal problem at bay
If you use round material especially on trailer with the pins removed and lid off the hinges won’t be obtrusive
Steve
'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
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