I don't believe there is, no. So in WA specifically there isn't really a benefit to licensing at a lower weight.
But I wanted to call out the distinction between
licensed GVW and
manufacturer GVWR. It's likely that distinction exists in other states as well and means the higher 350 GVWR doesn't need to be a penalty if you don't want it to be. I can only speak for WA as I called the WA DOL specifically to confirm how registration fees worked.
(They technically don't even use the GVWR at all in licensing in WA. It's simply not a factor. They default to a multiplier on the curb weight. If I remember right it's 1.5x, but there's nothing stopping you from specifying any licensed weight as long as it's at least the curb weight.)
Insurance
may be higher for the 350; however, I doubt it's significant and also doubt it would be based on the GVWR, just the claim rate for the different model.
From my research, the only places GVWR matters is:
- Determining if you need a CDL. If the combined manufacturer GVWR of truck and trailer exceeds 26,000 pounds you need a CDL (with an exception for RVs).
- Maybe for determining if you are required to chain up in mountain passes. I'm still not clear on whether this is based on manufacturer or licensed GVWR. This would be a 350 downside in WA technically, if they use manufacturer GVWR, but from what I've heard here on the forum it's never enforced in practice on 350's.
- Maybe for liability. If you are knowingly over your GVWR and get into an accident, it's possible your insurance company could try to deny your claim. It could also contribute to a negligence charge. I have yet to read about either one of these happening, but given how messy contracts and law can get I fully believe it's possible.
While I ordered on the false assumption GVWR mattered for road legality, when in fact it's licensed GVW that matters and is separate, I'm still happy I ordered a 350 for the third point. I want to make sure I don't become liable when loaded up, even if mechanically the trucks are identical.