Forum Discussion
Ron_Gratz
Apr 02, 2016Explorer
Aron wrote:A pair of 1000# WD bars (two bars rated at 1000# each) typically would be used with a tongue weight in the neighborhood of 1000#.
There's one piece of Ron Gratz's WDH thread that I'm still not clear on. I understand all of the physics/math involved, but it's just assumed that the two 1000# spring bars generate 2000# of "load". Is this supposed to be representative of a system such as a 10,000 GTW/1000 TW system, or one more like a 20,000 GTW / 2000 TW system?
The amount of load applied to the bars is determined by how "stiff" the bars are and by how much you make them "bend".
The magnitude of load which could be transferred to the TT's axles would be determined by 1) the combined chain load applied to the two bars, 2) the effective length of the bars, and 3) the distance from ball to midpoint between TT's axles.
Assuming a load of 1000# applied to each bar, effective bar length of 30", and ball to axles distance of 200#,
the amount of load transferred to the TT's axles would be approximately 2*1000*30/200 = 300#.
Let me know if you have specific questions about how to determine trailer-induced load acting on the tow vehicle.
I'm always happy to crunch some numbers.
Ron
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