Composite single beam landing gear
A guess:
The wheel spindles are rigidly fixed to the ends of a single-leaf leaf spring--the "single-beam." The center of the spring is mounted to the fuselage structure. The spring material is something like a carbon-fiber/epoxy composite.
(At least one common high-wing light plane has this arrangement with a steel leaf. It seems like a neat but heavy solution. Composite material would be lighter and allow stiffness tuning by ply orientation.)