Well actually it’s exactly the same effort to wire them. It’s still two cables you just connect to different posts on the battery.
With 2-gauge cables you should be fine.
Two 6s in series is more advantageous in this situation from a load balancing standpoint, since all the load has to pass through both batteries in a single electrical loop.
2017 Northern Lite 10-2 EX CD SE
99 Ram 4x4 Dually Cummins
A whole lot more fuel, a whole lot more boost.
4.10 gears, Gear Vendors overdrive, exhaust brake
Built auto, triple disc, billet shafts.
Kelderman Air Ride, Helwig sway bar.