As as been said above, check your wheels to make sure they are rated for 110 psi. This will be molded into the wheel usually on the inside of the rim. Just grab a flashlight and crawl under and take a look. If it doesn't say 110 psi, it might have a weight rating which will be greater than the load max of a 80 psi tire. The GW Marathon has a weight rating of 3,420 lbs at 80 psi vs the G614 at 3,750 lbs at 110 psi.
As far as the size goes, the GW Marathon ST235/80-R16E has an outside diameter of 30.7". The GW G614 LT235/85R16 also has an outside diameter of 30.7".
As was said above also, the G614 is a perfect fit.
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Ed
KM4STL
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50X, TST Systems 507 TPMS, RV Flex Armor Roof
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