Transmission fluid for towing

[PeterF]

Just purchased a 2013 Q7 as a towing car for our caravan weighing 1800kg. I plan to have the transmission fully serviced, but am wondering if the fluid should be upgraded to a high viscosity type for towing. I read this somewhere but the owner's manual says nothing about this. Any advice please?

[Steve Q]

I think the normal oil should be fine