[Ozzie Cozzies]

The distribution panel is at opposite the front door. I'm planning on installing the inverter on the driver side of the solid wall separating the pass through and the battery compartment towards the king pin/ nose end. Coming from the transfer switch (very close to AC panel) to compartment wall is 8', across the compartment wall is 6', down compartment wall then loop back under and connect to base of inverter is 5', giving 19'. Cable length from transfer switch to inverter plus cable length from inverter to panel about 38' - give or take a bit.
The extension cables come in 25' and 50' - that's why I chose 50'. Yes, I got a shock when I added up the measurements.