I wish I had my RV outside (in storage) but when I changed over to my 6 volts it seems like the were either 2.
I know 4 gauge was the largest wire that I could fit in the OEM Converter when I installed my inverter.
Looking at the picture of the batteries below Im thinking 2 g? I would be surprized if they were any larger than 2g.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.