my 18' tandem axle 12k hybrid dump trailer seems to be the ticket, it currently has 3k worth of trimmings in the dump body, plus a 1k mower and all my other equipment on the front deck. but i pull it with the f250
seriously though, if youre stuck on 10 or 12, just go with the 12' one. tandem axles help tongue weight alot, might as well get brakes on it. make sure you can fit sheets of drywall/plywood easily if its enclosed. Tractor supply had some tandem axle open deck trailers that looked decent enough for DIY/weekend warrior type.