When I built my custom hitch, GN/5th, I set up a test to prove my design. Tests were preformed with a new 1-ton and 2-ton hydraulic jacks as I wanted a rated capacity of 4000/lbs on the pin. My test plate length was 34" or the spread of the frame rail center line on a 02 F350 DRW.
Using a 3/4"x8"x34" plate with center 3/4"x8"x12" bolted plate located in the center of the 34"span. With less than 2000# I could easy deflect the 1-1/2" plate thickness.
Using two, 4"x34" channels with a center 3/4"x8"x12" plate, I could hold 4000# of center pin weight with a 3/8" deflection.
My final design was two 5"x34" channels with a 3/4"x8"x"12" center plate with zero deflection at 4000/lbs pin weight.
In general terms, from the above, the depth of beam is more important than material thickness from a top deflection force.
From a side deflection force, then one would increase material thickness and width.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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