I have towed my Enclave(2011) for 12 months without a problem. The only fuse I pulled is the 50 amp. But again, I made sure the ignition was in the Accessory position, and I turned everything off before pulling the fuse. The thing that bothers me is.....that even though you turn everything off, with the key in the Acc. position, the circuit is still hot when you pull the fuse. This will cause some arc in the fuse panel. Don't know if GM has considered this, and the fact that it does cause a fault in the codes ocassionally. In any event, I have towed for 12 months w/o a dead battery. For what ever it's worth. Take care.
P.S....when i reinstall the fuse, I put the car in park and turn the switch to off to keep the circuit from being "Hot" when the fuse is replaced. Again, F-W-I-W.
2002 Monaco Diplomat Triple Slide PST
2011 Buick Enclave(AWD);88 Ford Must. GT(Stick)
1970 Home built 11.5 ft Slide-in Cabover