I don't see dual battery or "more battery" (lithium) on here. For me this was my 4th mod after tires, sliders, compressor. I know I know... You can bring a jumper but if you run a fridge or just care to make 100% sure you can get home (running solo with the family for example) a jumper isn't going to help you if your battery won't take a charge since these trucks won't run on alternator alone.