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John....ehh...I'm not following the straight edge on top of the tube concept...more thinking...maybe you are saying measure the gap between the bottom of the straight edge and the tube. Yes, that would be a measure of the arch, or lack there of.
I'm towing just a bit nose high. Maybe a quarter of a bubble.
I think if I would have rotated more often I would have never noticed.
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2018 Ram 3500 Laramie CC DRW LWB 4X4 Cummins Aisin 3.73
Reese Goosebox 20K
2018 Heartland Landmark 365 Oshkosh
2008 Bigfoot 25C9.4 LB Cabover
2023 CanAm Defender SXS
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