Would make things easier but I have seen off road vans advertised with less than 200kgs payload, given that they have 270l water capacity.... I think we need TARE & ATM as a minimum.
That's what we've got
Tare 1600, ATM 1800, GTM 1960 kg.
Van has an 80l water tank, & provision for 2 x 4kg gas bottles, so if we fill those, before we even think about food, drinks, clothes, seats, BBQ, firewood, tools etc etc etc, we're down to only ~110kg available!
I can see that tare includes the empty water tank & gas bottles, but does it include a spare/s & the van battery
I really think that this all needs to be landed back on the manufacturers that the tare is measured with everything full eg water, gas, spare, battery etc