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Originally Posted by Denny_A
..... But, I wasn't loading 200+ lbs of cargo behind the axle.
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I think we're in blustery, finger waving, 100%
total agreement! 
If you don't abuse your 4R the way I do, then the 750 lb bars are gonna be fine
. But if you load as I will, then they'll be lookin' a bit marginal (or, maybe even WORSE than "marginal").
I think you've illustrated ONE point of this thread exactly... since you haven't got all my #$%$ loaded back there,
you've got nothing to add (beyond your tongue weight) in Draw-Tite's recommended forumula.
But folks other folks like me, who DO pile lots of stuff behind the rear axle of their TVs
should do the math for their loading, definitely add some lbs and check the result.