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Stanley,
I originally put Michelin 17.5s on my past Suites--ran them from about 2008 to 2012. Started a trip to AK and had a mobile tech tell me I had a tread separation. Upon further inspection, there were 2 tires bad, but the tread looked like new. Replaced them all right then. I put Coopers on and ran them til I curbed one and knocked out the alinement, had to replace them prematurely. Put Sailuns on and they were running fine at 2 years and about 20000miles. So, one set of 17.5s made it 4 years, and the others I didn't have long enough to run the time up.
Personally, I would try them longer, but you should have a good shop look at them.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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