You cannot hook in at the inverter. The red and black wires you see attached to the inverter are the DC outputs - NOT AC!! If the trailer has the generator prep package (a very expensive option) there will be wires run to the front storage compartment. If not, you still have a couple options. The easiest, as Art said, is to use a 30 amp adapter and plug in with the regular power cord. The other option would be to wire in an auto switch near the electrical panel and run another wire to a plug for the generators. Auto switches, depending on what they have built in (such as voltage regulators, surge protection, etc,.) run anywhere from around $250 to $700, not counting the wire and plug.
You didn't state where you plan to run the generators at. It's not a good idea to run them in either the basement or front storage area as the generators need ventilation and you don't CO2 coming up into the trailer. Ours are mounted in a removable wooden rack that sits in the rear of our truck. I either pull the truck to the back of the trailer for long term, or run the power cord with a 30 amp extension to the front of the trailer for one night stands.
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