I think
i suspect a gvm upgrade for the grenadier will turn out to be relatively easy; its not the engineering that’s limiting capacity, it’s relatively consistent around the globe rules around the 3.5t mark.
unfortunately as a consequence of the agency model Ineos wont be able to sell the upgrade new, at least not without a pile of regulatory problems that are unlikely to be solveable for reasonable money. So unlike the iveco daily option at new, this will be aftermarket.
dont think it will be something i need, but if the brakes are beefy, then perhaps springs is enough?
id be interested if anyone knows, if you say upgrade to 4t gvm, does the total car plus towing limit stay the same? If yes, then you’d infer the brakes will be adequate.