I built this one about 15 years ago. It's 65" wide and weighs about 700 lbs. I can add 4 concrete weights totaling 180 lbs to bring it up to almost 900 lbs. The side runners were made from an old school lunch table with steel seats. I welded 2 half of the 8' bench together, thus the 48" length and filled with sand.There is 1/4" plate on the bottom of the runners.
The blades are adjustable. Here in the desert the soil is either loose blow sand or rock hard caliche. I have no gravel roads. The doing sand, the front blade is adjusted to flat and the rear is adjusted to rear down to smooth the sand. When in caliche, the front blade is adjusted to a 1" cut and the rear adjusted to the condition. The concrete weights are 45 lbs each and when in caliche are added to the front to enhance cutting. In sand the weights are not used or placed evenly.
The 3 point connection works with my T&T. I can pull it forward to let the plane just float or push it back if I only want the back blade to smooth.
The blades rotate on 1" bolts acting as an axle.
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