T6.1 12v electrics

Hey all.
I’ve just ordered a t6.1 panel van (lwb 4mo dsg) and through a bit of a pricing error by the dealer I’ve gone ahead and specced the factory fitted parking heater.
My question is when I convert the van to a camper in a couple of years time will I still need to add a leisure battery to run a fridge and a couple of usb points given that the heater is run off a second factory fitted battery. Also if I do need to fit a leisure battery will the alternator be man enough to charge both factory fitted batteries and another leisure battery?
Thanks All.
 
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