Not sure about these days but about 5 years ago I got caught towing 2000lts Jet A1 without any form of license and the trailer was over the vehcles max towing weight. I think I had broken about 5 laws in total it took me 5 hours to get home and they impounded the bowser. I was lucky claimed total ignorance/insanity and got away with it.
I guess what Im trying to say is be carefull you dont get caught I know I wont be doing it again. Buy yourself 5 Jerry cans put them in your boot. (someone told me you can carry up to 100lts)