A flatbed trailer bridge transforms a conventional flatbed trailer into an elevated structure enabling safe transport across gaps, ditches, or uneven terrain. Unlike standard bridges made from steel or concrete, trailer bridges offer portability, versatility, and. Where is the best place to buy an old used 45ft aluminum semi flatbed trailer? I have a pond with a bridge that needs to be upgraded or completely replaced. Plan on removing the axles/wheels after it gets to the pond location. We had to make some last-minute adjustments because Thomas admits the "build plans" are stored in his head, not on paper. The guys navigate these curve balls and get the bridge. more In. Want to build a foot bridge spanning roughly 30 feet over a creek. The existing bridge, which was constructed many years ago by the previous owner, is neither strong enough nor wide enough for me to drive my garden tractor across. He paid a few hundred dollars for the trailers and stripped them down to just the decks, which he set on top of field rocks that he piled onto both sides of the. They make 1000 lb capacity deals that mount to the rear corner of a truck bed and include a stabilizer jack in line with the column. Long beam with a gantry crane/hoist. Only difference is that theirs.