[Brian in Oregon]

Nice work!

FYI, your trailer is not a military M100.

It's a civilian Bantam T-3C.

The clues are:

The factory tailgate (military trailers have no tailgate).

The rear sheetmetal panels containing the tail lights. These reinforce the bed sides, which tend to flex because of the tailgate cutout.

The lack of grab handles on all four corners. (M100 and M416 trailers have handles).

The stack pockets. Military trailers lack these.

Three tie down loops on the side. Military trailers have four on the side. Very early Bantam civilian trailers also have four, but, these lack the sheetmetal bed reinforcement panels and have angle iron struts instead.

No parking brake. Military trailers have parking brakes.

The Fulton ball hitch. All military trailers used lunettes.

Speaking of the Fulton hitch... hopefully you didn't toss out the old hitch setup. There are those restoring these trailers who would gladly purchase it from you.