How thick was the aluminum you used? I made a flatbed with some old plywood, but it could be lighter.
according to the tape measure, it's right at 1/16th of an inch thick. i'm not sure what aluminum gauge that is. they use a different unit on sheet aluminum. .03-something-or-other. i work with sheet steel 99.99999% of the time. i can tell you it's close to 16 gauge sheet steel.
i would have preffered to use thicker aluminum, but this was free. i would have preferred 1/4" treat plate. but that stuff is outrageous. i could buy a new trailer, the one i want, for the cost of a sheet of 1/4" aluminum tread plate, enough to do the trailer.