It's the MTPLM figure minus the MIRO figure which gives you the payload so if you know both of these you can work it out. There should be a plate below the door with both the weights.
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Never trust the internet. Check the chassis plate. Thats the only thing to trust.
Except dont trust the MIRO or unladen weight either.
Take it to a weighbridge and get it weighed. Then you know genuinely how much you can load into it.
In one of the caravan mags a guy found his caravan to be only 60kg below the gross laden weight and not the 200kg or so below that the brochure stated.
If he had loaded close to 200kg he would have overloaded the caravan and in trouble if stopped.