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There is no comparison to the IS out there. When I go over a pretty rough railroad crossing with the truck I definitely feel it but can't feel the trailer cross it at all. The disc brake system is even more impressive. Not saying I can stop on a dime but pretty close.
The main reason I did the is was not for any of those above reasons. It was to get away from Spring/ shackle/ wet bolt/ spring hanger issues with the old horse and buggy system.
Previous to doing the IS I personally replaced everything under there besides the axles. Even after doing that the problems persisted.
Trust me when I tell you this system is Beefy in comparison to what came off. If memory serves me correctly I believe the IS and it's related to Steel framework added around 900lbs of weight to the trailer
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