The irv2.com forum conversations have some Ford people in them, basically the outer holes are the default positions from the factory. Since Ford has no idea what the frame final build or use will be, they just send them out as default and let owners or other companies make any changes. Keep in mind the F53 chassis are almost always stretched by MORryde prior to the RV house being built on it and the characteristics of that change cannot be overstated. The body becomes even a longer wind sail and will get pushed around by passing semis and wind even more than a simple box truck.
Thousands of owners have done the CHF and are very happy with it. We are very happy with the way our Hurricane rides now (and it is the only mod to the chassis that we have done.)
The other thing to check is to get your coach weighed and set your tire pressures accordingly. That also helps with the ride much more than you might think.
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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