Been there done that, I had that same idea, I found a toyata 2wd pick up and removed every thing off the frame except for the axles. Took the brakes off, just ripped them off. You don't want them on there grabbing and making it hard to pull the wagon. We used channal iron to build up a frame to attach a deck too. Our deck is 6 x 14 ft, its made out of 2x8's roug hcut with a sawmill. The hitch and the turning was the hardest part to fix, and still is. We basicly cut a hole in the middle of the cross member right over the fron axle, attached our tounge/ hitch to that. By putting a pin in the hole we madethe tounge pivot side to side. Then we attached attached to tie rods to the tounge which allowed the wheels to follow in the path of the tow vehical. All we did wa extend the tounge past the cross member and put a hole in the end of it. On this toyota teh tie rods are behind the axle not the front. plus they go right across. Sso we welded a bolt onto of the tie rod right in the middle, The tonge went over the bolt and and is held down with a nut, simple. The only trouble is the frame is too low to the ground and the when we put a heavey load on the deck like two tonns of hay the deck bottoms out on the tires, So we have to raisethe deck or block up the axle from the frame. We have the tunge under the cross member, we should have it ontop. When the wagons loaded it digs into the ground. Plus its vertialy imposiible to back up, mindya having one bigger tire on the front dosen't exactly help. But im not two worried, just got a 3 ton ford truck with a 14 ft flat deck for $400.oo this fall. It going to carry some seriuos hay, the wagon will be parked beside teh shop still waiting to get fixed. You might consider cutting off teh front axle and just having a single wheeled trailer, eaiser to back up and less work to do building the trailer. Figuering out the hitch/tongue is the biggest challange, get it wrong and you have steering problems. G-luck
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