Current thinking is that maybe we can life the front and wedge a solid wooden broomstick under the machine, towards the back, we can rock the machine forward and get the remaining back foot over the obstacle.
Could you perhaps loop a rope, over the machine, so it lands at the top rear - then pull on that, to get the rear feet up from the floor?
Washing machines, typically, only have solid parts around the perimeter, with bits of frame underneath, but generally open with access to the internals.

