Billsmax, not a 2008 but I have a 2004 Sig. on the same chassis and I run 315 80 22.5's on my steer with NO problems at all. There is a different pressure index if you have 8.25" wheels instead of 9". It was shown to me in the Michelln Book in the back.
Good Luck
Dave Hinds
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2004 Monaco Signature with a Detroit 60, Vorad Radar, Samsung Fridge, Induction cook top, 2020 GMC Denali
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