[bsmith0404]

I've never seen a 6 lug wheel rated above 80 psi. That could be because there isn't a need to test them above that due to the weight they are intended to carry, but I don't know that for sure. A couple other thoughts, trailers with 6 lug wheels typically aren't that heavy, adding an F or G rated tire at 90 or more PSI will give you a very stiff sidewall causing more bounce and possible stress your trailer. If it were me, I'd go with an E tire (I'm guessing you have Ds now) and run it at 75 psi. That will still give you additional carrying capacity, some sidewall flex for a smoother ride, and stay within your (most likely) 80 psi wheel rating.