I now have 45,000 miles on the trailer in 3.5 years. We put 20,000 miles on in 2010 alone.
We haven’t ever experienced any damage from a rough ride.
However I have had to replace brake shoes and repair the spring hangers.
Then only reason I can see for using IS is to keep from braking the under engineered spring attach points. I found it cheaper to have my metal structures engine tell me where to put the braces to stop that. It’s just to bad a waited until the frame failed.
Phil P
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2009 Montana 3665RE
2009 Duramax 3500 DRW quad cab
personal web page https:// www.sallyscoffees.com
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