As wired from the Factory, the inverter only supplies power to the Fridge. It probably could supply some power to another low current devise but remember, the more power you draw, the bigger the drain on the batteries.
Per the Remote Display, the Fridge draws approx 10 to 11 amps from the batteries when running.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top