Good advise form Kiwi rs4 especially radiator and larger trans cooler. I would also suggest not towing with the overdrive button on. and just drive slower in 3rd! Most manufactures recommend not using overdrive when towing. Interesting enough Holden don't recommend towing in sixth gear in their V8's ( sixth gear must be piss weak!) Electric brakes won't need to be worried about with just a 6x4. They are required more for large caravans, large boats, yachts etc.
The safest things I have found with towing is to drive slowly and not be in a rush to avoid the scary as hell! jack knifing or speed wobbles. Have towed many thousands of km's with a large boat and car trailers with two scary exsperiences!! But now I just take it easy! Have a good safe journey