If I understand the question correctly, you are thinking about hooking the inverter to a 110 ac outlet to energize the rest of the outlets?
If so, unless you installed some sort of switching device, you would also energize the prongs of the trailer's power cord... I think that would create risk of electric shock if someone touched the prongs, or if the hot prong touched something metal a person could get shocked while standing on the ground and touching the trailer...
Maybe I didn't understand the question?
Dodge Ram dually laramie 4x4 w/jake, B&W, Brakesmart.
Kit Patio Hauler 394F toyhauler 5th wheel
Camo 680 Rincon, Green 500 Foreman, Blk twincam Roadking