I have a 2008 cardinal 5th wheel that have the original ,Karrier H/D loadstars on it size st235-85-16 load range G 14ply. I'm looking to replace them because they are 5 years old. I called Kenda today and spoke with them and they do not make this tire in a 14 ply anymore. They redesigned it and it is a 12 ply tire (F rating)tire that carrires more weight that the 14 that they made..The G rated tire carried amax load of 3750lbs. per tire,the new f rated tire carries a load rating of 3960 per tire.... I just not know what to do.It's a lot of money to spend on tires but I don't want to tear up may camper also. I have checked with forest river and they now put the goodyear marathons on the new ones, that tire is a G rated tire,but saw a lot of bad reviews on it and i know of the G614's rst.. so I don't know..any advise would be helpful..This trailer has a GVWR of 15730