Quoted from loneranger:1800 watts/115 volts = 15.65 amps. The amp draw for a pin is what? 3 amps at the most?
Inrush current when the machine is first turned on is probably more than that. 4-5 amps maybe. Even so, 3 pins to one smart outlet should be fine. 4 pins would likely be OK. I wouldn't do 5.