Doesn't it have wheels up near the handles, so you can back it up to the van and tilt it in? Or is that the airflex?
I think the John Bolton technique with the Scorpion is to park it facing the van, tilt it back so the front wheels go up to the van floor and then in she goes. Will that not work with the advance?
the way I used to load my ninja was to park it facing the van, stand sideways crouching and sticking my knee out behind the machine. I'd then lever the machine up onto my inner thigh and roll it in on the back wheels. Will that work? You just have to keep your back straight.
Regarding emptying the machine, if you get into the habit of only just having enough in the tank to complete your job, you can empty the rest of the water out with the vacuum hose, just hold the edge of the cuff in the water so you don't strain the motors.