OK, here a twist. I just double checked the 8000 lb hitch on our Quantum class C.
To get the Road Master towbar level when hooked to an '05 Liberty I have a 2 1/2" RISER. So my added force is two and a half inches above the receiver center line. How does that effect the failure potential? Looking at the side plates on my hitch they appear almost double the thickness of those in the pictures and the bends have a large very noticeable radius to them. I wish there was a formula to multiply drop or rise by and subtract from the rated weight to get an idea where the safe range is. But I'm not smart enough to create it, any mechanical engineers in the crowd?
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