Perkins — Machine.

A Perkins service procedure — check it applies to your exact model before use.

Procedure

If the loading surface is not horizontal or is higher than 380 mm (15 in) from the ground, use a winch to load machine. If the loading surface is horizontal AND is 380 mm (15 in) or less from the ground, the machine may be driven onto the truck or trailer.
To winch the machine onto the truck or trailer, attach the winching chains to the rear tie down locations. The rear tie-down locations are through the U--bolt section of the main frame under the side bumpers toward the rear.

Source: manual:tennant-800-810-rider-floor-sweeper-service-manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.