Assuming they are 7000# axles you were on the light side with the 5" frame. When I calculate it for deflection with a safety factor of 3 I would use at least C 8 x 11.5 for channel or s8 x 18.4 I beam (8" wide flange would work as well) The higher the member height I or C the stiffer the trailer frame will be. There is no need to go more than 8" as it is over kill already unless you can get some cheap material. I would weld some 3" pipe between the frame rails if using C channel
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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