In 2017 Sport you have two USB sockets. I changed one to a 12v car socket. You can find on Amazon 12v sockets, meters, and Anderson sockets. The sockets are used in Ham Radio a lot. Then I purchased a 200 watt inverter ( Harbour Freight for $19.95), for use to power TV on other side of bed. Plus, I use a sleep breathing machine.
But researched, you can with the 6 gauge factory installed wire from batt to power distribution unit, a Samlex 600 watt Sine wave inverter can be attached. The power unit is made by WFCO - they make a transfer box ( T-30 ). It goes directly into power unit, three pairs of wires; 1st goes to 110 input side, 2nd goes to shore power line, 3rd goes with a power plug into 110 v output of inverter. The 12 volt
going to power unit "Y" positive to both power unit input and a lead to a fuse unit of 150 to 200 amps than to inverter. Do the same on negative "Y" to both units.
So wished Air Stream would use 4 or 2 gauge wire so you could safely go to a 1000 watt inverter.