Then again, the simplest method of having higher current available is to do it your self. You need a source for that higher current, a method of getting it to where it'll be used, and then some sort of receptacle to connect things to it.
Having just dealt with GM about that sort of thing (the powering of options, not that particular vehicle), I have concluded that I can do it at least as well and much cheaper than the price quoted to me.
[I want to add a second battery. Can't do that with that model car. Then why is a space provided for a second battery? But you have to use GM parts/service to do it. Okay, how much? $1600.00. (after getting up off of the floor) For what?? For running a larger cable for the higher voltages it would carry. Don't want higher voltage, just higher current capability! Okay, just add this special "battery eliminator" device, $1600.00, on special today. Do you have any idea what a battery eliminator actually is? ... silence. It's just another battery you Twit! ... and it went down hill from there, you don't wanna know. I didn't purchase the car from the local dealer. But surely that wouldn't have had anything to do with it, right?]
The finished cost was less than about 20% of the price quoted to me and that included the second battery (AGM). Go figure...
- 'Doc