I have a gas Onan generator, and also placed the Magnum in the Generator bay, just above the generator. I ran the wires into the generator housing and used scotchlocks to attach the AGS wires to the generator wires. I also tapped the 12VDC at the generator. Works fine. make sure you get the dip switches properly set for your specific generator type.
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt Pure wave inverter/charger. 2013 Elantra on a Master Tow dolly.