As long as it is that then yes easily. We use to run t220 connects with a 825 payload with 650 tanks and they was on the limit. The tanks had a mark on them so they knew how much to put in. It was prob about 600-620 and they could only ever have up to half a tank of diesel too and they was bang on the max payload.
But I'm sure loads of people will come here now saying their little bit. I run a legit business so can't be seen to be doing anything wrong, of it was wrong they wouldn't have them in the van