DaveInDenver
Middle Income Semi-Redneck
I believe the consensus is that GVWR is nothing more than a guideline by the manufacturer, at least below 26,000 and any commercial use. The only possible legal reason to follow GVWR is in the event of a serious accident where lawyers will go over your truck with a fine tooth comb looking for fault.The specific GVWR was given on that truck for a reason. I would personally, never go above it, much less near it. Same thing on towing capacities as well.
To that end I guess it depends on how much you believe the number. There's plenty of anecdotal data to suggest that Toyota is consistent with their conservative philosophy and there's margin and maybe actual designed headroom in the number.
That is IMO all but a certainty with older trucks, the 79-95 trucks were way under their true GVW at ~5,300 lbs. You could easily exceed that by 10% without the truck blinking from a safety or longevity standpoint (which translated to a payload of more like +25%). It just got slower and slower.
I don't think the current Tacomas have the same margin but I also think 5,350 that mine has is still conservative. Same I would say about the Tundra.
On the flip side I could suggest that despite a higher GVWR some domestic trucks don't last any longer historically. So are their higher GVWRs valid?
My feeling comes down to what the companies variously expect of their vehicles. Toyota way back pushed the envelope with trucks that lasted 200K while the Big 3 expected you to replace them every 100K. So perhaps the GVWRs they put on them were reflections of that?