We used to use a couple of different trailers for hauling equipment that you could couldn't pull down the road. This was eastern Colorado, where big one-way disks and wide drills are common. The first one, which my dad built, was a big contraption that was a framework that you backed over the implement. It's pretty difficult to describe, but the thing was at least eight feet wide and about 30 feet long. It had two wheels on each side, near the middle. The framework was mounted on the wheels so that it would pivot on the wheels, and the frame was about eight feet high. Running down the middle of the frame was long shaft that had cables attached to it every few feet. Short lengths of chain were attached to the cables. The shaft was driven by a small gas engine via a worm gear. You would back over the implement so that the direction of the trailer was 90 degrees to the direction of the implement, hook up the chains and hoist the implement up. After safety chaining everything so it couldn't swing, you could take a 20 foot wide implement down the road and stay legal. We used it to haul all kinds of oddball stuff, even the occaisional broke down pickup that couldn't be towed. One nice thing was that you didn't need to have a tractor on hand to load or unload the implement. Another trailer we used was the commercially built Donahue implement trailer. It is basically a flatbed trailer, but you can detach the bed from the axles and have just the bed laying flat on the ground. You can see a picture of one in the link below. It looks like all of the Donahue models would be too big for your needs, but you could easily fabricate a small one.
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