First of all, most any 16" FW tire will be rated for 3200# or higher. The G rated tire will fit the wheel, and you should be able to inflate it to the 110psi as stated on the sidewall of the tire.
There are three key things to consider when looking at the load placed on the rig.
1. GAWR - If you have a 6,000 pound axle, you should not exceed 3,000 pounds at any individual wheel. 3,500 pounds for a 7,000 pound axle etc.
2. Load rating of the wheel.
3. Load rating of the tire.
Your load limit will be the lowest of the three. In my case, I have 6,000 pound axles, 3,200# wheels, and 3,520# tires. The maximum load I can safely tolerate on any wheel position is 3,000# due to the axle limitation.
I can install a Goodyear G614 G rated tire with a max load of 3,750#, but I'm still limited to that 3,000# load due to the axle. I've contacted the manufacturer of my wheel, and they told me in writing that the wheel is rated for 110psi, so it can handle the pressure of a G rated tire also. Of course, I have to use valve stems that are also rated for 110psi (or higher).
My G614s are going on next week, and I purchased the valve stems listed below which are rated to 120psi.
Metal TR-416 Valve StemsIdeally, when you install your tires, you'll inflate them based on the weight of the load, and not the maximum pressure on the sidewall. Use Goodyear's tire inflation table, and inflate all the tires to the correct pressure for the heaviest wheel. If you still want to inflate the tires to the max pressure, it is safe to do so, but you might get a little rougher ride and unnecessary tire wear.
Jim
