I found this interesting.
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
This is the tire load/inflation table from Goodyear for RV tires. I pulled this off of the page for the G614 tires. According to the page, RV tires should never be under inflated. They recommend that the tires be inflated to a minimum pressure based on the load they are carrying.
Here is my math with numbers from the CAT scales:
Voltage 3905 empty wt. 16,200lbs
Voltage 3905 maximum gross wt. 19,000lbs
Hitch Pin weight (Loaded rear axle wt. - unloaded axle wt.) 3720lbs
19,000-3720=15,280 actual weight on the trailer axles.(at gross wt.)
15,280 divided by 6 (tires)=2,547lbs on each tire.
According to the Goodyear chart, for my G614 size LT235/85R16 tires, the minimum inflation pressure at the maximum gross weight of the trailer is 65psi (single). So, if I inflate the tires to the maximum pressure of the Hi Spec rim, I am still well within the safe inflation pressure of the tire at that load.
Now before everyone starts telling me that you should always run the maximum pressure for your tires, I have a good friend that owns a lot of tire stores, a tire recycle plant, and 2 tire recap facilities. In other words, he knows a LOT about tires. His advice is the same as the information on the Goodyear site, make sure that your tires are not UNDER inflated. You don't have to run the maximum, just use the chart. That is why they publish the chart. As he said, if you were supposed to run the max pressure, then why would they publish the chart. Go to the door on your car or truck, look at the recommended tire pressure, then look at the maximum recommended pressure on the sidewall of the tire. I am pretty certain, that the recommended pressure on the door sticker will not be the maximum for the tire, and the manufacturers know all about this, but still recommend running the lower pressure because the tire is not carrying its max load.
So, to all of you wondering if you are taking a chance by running the 110psi G614's on your Hi Spec wheels, just back them down to the 80 psi that the rims are designed for, and you should still be able to load 3042lbs on each tire, for 18,252lbs of capacity, PLUS the pin weight that the truck is holding. (3720lbs in my case) for a grand total of 21,972lbs (for my trailer). That is actually over the gross weight of the trailer by almost 3000lbs.
In conclusion, I believe that I will be well within my safety factor running 80psi in those tires, but as always, I will be constantly taking tire temps, and have my tire monitor on watching pressures.
I am by no means an expert on tires, but I feel that I have done my due diligents in my research. Don't listen to just me, go do the research yourself, and if you come up with something that I missed, by all means, post it, but have the facts to back it up. If you feel as I do, great. If it still makes you uncomfortable running the low pressure, then DON'T. Solve this dilemma however you feel you need to.
Now go ahead and start the debunking of this information if you want to.