5.5' trailer type (3" x 1/4" angle iron frame, 3/8" plate steel, greasable bearings) and a couple 7' heavy duty 3pt (cat 1) (1/4" 3x3 tubing frame, 1/2" plate steel, greasable bearings) that I built a couple years ago from a couple old junk cultipackers..
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The challenge these days is finding even JUNK cultipackers, so that you can reuse the discs from them. The prices people are asking for these old things that they used to give away are becoming almost unbelievable.
Farm sales are about the best place to find them. I paid $75 for mine then had to put a tounge on it. (it was wood) Unfortunatly as previously these are all iron and the scrape buyers trip over themselves to get to them.
Heres one we made from Tires laying around and some wood. http://www.youtube.com/watch?v=guIEDJ9b0iQ
Workes pretty well. Turns out we cant rent a crusher/aerator unti for 12 dollars a day from a local store so we will be trying that next year.