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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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