While we do not have the G614's, we nevertheless replaced the rims on our first rig, a 2006 3400RL, with ALCOA aluminum rims (BTW, the G614's were not available then, at least in our market area). While costly, we decided that it was worth the money since we had rims that could support 3500 pounds (our axles are rated at 7,000 pounds) at 110 psi and we could mount G-rated tires on them.
Now that we have a TST monitoring system for our tires we are very happy. We feel we have a good combination of technology and wheel/tire pairing.
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