I have a 2011 trd sport and was wondering if anyone has done a stand alone system and where you put the other battery? Not a whole lot of room in the engine bay.
There's mounts that fit dual batteries in the stock location but I wouldn't put that much weight on the inner fender. If you have an offroad you could have put one on the passenger side where the ABS actuator lives because it's not there. Not sure where else you can mount it that isn't custom.