Using higher voltage reduces the need for larger cable but that usually means hooking the panels in series. Panels in series are more prone to issues with shading. This system is small enough I wanted them in part all to reduce shading issues. A few hundred watts at 12v isn't too bad. The heavy cables are absolutely needed for battery to inverter with a shunt in between. Especially a 3000 watt inverter.
2014 Jayco Eagle 298RLDS
2014 Ram 2500 6.4 Hemi 4x4