These old free utility trailer plans will still make a good worthwhile project that you can use or even sell.
I found an old farm welding projects manual and it's loaded with some very interesting plans for equipment that is commonly needed on a farm, even today. It included such things a tractor jack, weed sprayer, sheep holder, as well as a welding table, and different types of tractor trailers.
Here I have included with permission two utility trailer plans and parts list for you to study or use for your own projects. The first one is a good old design for towing behind your car or truck. The second plan set is for towing behind your tractor (I think).
NOTE: In the directions and list of materials you can do as suggested when it comes to the axels, or you can buy a trailer axel kit and save yourself some time (that's what I would do).
To build the trailer axle you will weld angle iron together. The measurements of this angle iron are 2 inches by 2 inches by .25 inches. You will weld them in a box formation.
You will then weld the front wheels (on the end).
As you can see in the old drawing below you will cut and weld the pieces of the frame.
For the fenders, you will weld sheet-metal to a frame tubing (1/2 inch pipe).
For making the gates and the side panels of the trailer you will simply use 1 inch lumber (tongue and groove). You should be sure the gate has hinges. This way you can open them and allow for more room for tall or long things you will may be hauling (tall trees, lumber, fencing, tubing, etc.). You can make the hinges out of 1/2 inch tube or pipe, and make the pin for the hinge out of 5/8 inch rod. Simply drill a hole for a cotter pin.
Basically you're going to cut up the materials and weld it together: The spring hangers on the front of the 2 wheel utility trailer should be welded right on the frame channels.
The hangers in the rear should be fastened to the cross channel.
The trailer axle should be fastened with ubolts right onto the main springs and the overload springs.
The utility trailer box flooring uses a 2 inch x 6 inch board (tongued and grooved) on the bottom which is then bolted directly to the 2 inch by 4 inch cross pieces. Both ends of the trailer and the sides are to be 1.25 inch x 12 inch clear fir wood.
The End-gates on the trailer will be able to slide cleats (made of angle iron), which are then held by 3/8 inch rod(s).
This two wheel farm style utility trailer should be able to hold up to 1600 pounds or the equivalent of 30 bushels of grain.
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