it will be a 1200kg payload then, confirm it by looking at the log book and service manual.
Come to think of it i think the 1.9 were 850 kg 950 and 1000 and the 2.5 were 1200kg
There is always the oddballs , like my van a 1.9 swb t 32 window van they are as rare as rocking horse pooh in that combination
even so a 1000kg should just about do it if you stick to 650 kg tank