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dbear · 11-21-2018, 05:37 PM

The fulcrum is actually the truck rear axle. The formula to calculate the resulting force at the front axle is F1*D1 = F2*D2, where F1 = FA unloading, D1 = truck wheelbase, F2 = trailer pin weight (downward force), and D2 = hitch to RA distance. Solving for F1 = (F2*D2)/D1. Guessing a 5er weight of 15K# with a 3K# pin weight. Using your truck wheelbase (176”) and hitch 6” aft of RA, the resulting unloading of the front axle would be around 102#.

11-21-2018, 05:37 PM	#53
dbear Junior Member Join Date: Apr 2013 Posts: 3	The fulcrum is actually the truck rear axle. The formula to calculate the resulting force at the front axle is F1D1 = F2D2, where F1 = FA unloading, D1 = truck wheelbase, F2 = trailer pin weight (downward force), and D2 = hitch to RA distance. Solving for F1 = (F2*D2)/D1. Guessing a 5er weight of 15K# with a 3K# pin weight. Using your truck wheelbase (176”) and hitch 6” aft of RA, the resulting unloading of the front axle would be around 102#.