Wiring my inverter into the GT power supply

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I own a 2010 GT350TS. I will be installing a Magnum inverter with a built in ATS. On my previous coach the wiring was easy to follow and logical in my mind. With my new coach the usual ATS that allowed the current to pass through from either the Genny or shore power is non existant. I know that NW Jeeper says this condition is inconsequential but for the life of me I cannot visualize how to connect the inverter in this new GT configuration. I suppose tech support at Magnum can assist me but I wanted to hear from those who have actually done this. My intention is that the inverter powers the whole coach with 120 VAC when shore power and the genny are not in use as in when boondocking. Of course, I must make a deliberate decision not to use the air conditioners and the electric water tank heater when the power is being supplied by the inverter. Has anyone wired their inverter as I am hoping to do mine? I realize that my wiring concept is frought with visions of battery drain when unhooking from services at the campground and the inverter automatically assumes the power source. On a few occasions we did just that but a bit of mental discipline minimized the number of times we got caught. Also, with the ability to program the inverter's low voltage shut down to say 12.2 VDC, an oversight is not catastrophic.
I look forward to your feedback.
Lloyd