Attach 2 pairs of appliance rollers, purchased from ebay or similar, using small nuts and bolts. Each pair is normally rated at 600 lbs (272 kgs).
The height of the front valance should be at least 25 1/2 inches (650 mm) above the ground.
It may be necessary to remove the left-hand rocker cover because the oil filler spout may foul the valance.
See photos below.
Underside of trolley:
Halfway stage:
