One other big advantage of the pull, or transport type disc over the 3-pt is that they maintain much better ground contact and do a better job on each pass with less weight and using less power/fuel. 3-pts are ok for small gardens or other tight spots but if you have anything more than 1/2 acre or so, you are far better off with these other types. A old, 8 ft, JD pull-type works good for me, even on a 2wd tractor with just 20 hp, but I dont have any transport issues. I also have a 6.5 ft, Ford 3pt, which has larger wheels but is far less effective due to the contact problem. That one takes about 30 hp to operate and takes a few more passes to get the job done. If you do significant acreage and need to move over roads, then a transport type is the best way to go and anything in the 8-12 ft range will work well for you. Those 3 pts types are easy to sell as most foodplotters and such dont know that they are about the least effective type of disc that there is for all but the small time gardener. It sounds like you learned that lesson already.