I think it could be a great trailer for tin/shred, even for plastic or cardboard. You could put all kinds of volume on one, even if not so much just concentrated weight.
and Sledge is right on, you really need one ready made for it. I built my little trailer out of scrap and sheer neccessity, during a period of time but no money, and as is usually the case, could have bought a better one later for little more than I had in it. Not to mention the time involved.
If you look around enough, you can likely find one ready made like you're needing, from an individual, business, or agency, who bought it and never used it, and just wants it gone(if you're lucky, and diligent ; ) and won't be found squirming under an occasional heavy equipment type piece of machinery
back to the one you're considering, i believe it could be a great trailer for large, light, loads. (like the ones you'll see with cattle panel type sides around it 8 foot tall ) I have a frame here from an old 16ft travel trailer which basically only needs a floor and some sides on it, and one likely thing you'll find on yours too is the inside wheel measurement is only about 5-6ft, meaning even if it was a dual axle and beefed up for an auto, the bed would need to be raised above the wheels to accommodate a vehicle
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