I'm working on setting up a new Reese Dual Cam setup. I think I need a 1" extended ball, and wonder if I would benefit from a 2". Here's are some photos of where I'm at now: Side view, I think...
As the turn starts, the inside bar needs to ride up the cam before it unloads. It seems like this would have the effect of tightening the chain some.
From the chart, it looks like the reduced slope of the inside bar load line from 0 to -10 degrees may be due to this riding up effect. If that's the case, hopefully you can describe why it initially decreases slowly rather than increasing a little first.
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