In addition to proper loading, a stand alone sway control unit could be used, too. I'm in the installation process with this unit, plan to check pickup/trailer turning clearance and adjust cable lengths today when the rain stops.
This may not be the final location for the Sway Control, will see. Did not drill any holes in the Ollie hitch/frame during installation, used aluminum angle to mount. Our Ollie comes in at 4960 pounds ready to camp with empty fresh, grey, & black tanks. Not using a WDH for now, but wanted to try this sway control since the Tundra manual requires a trailer sway control for trailers over 2000 pounds. We have not had any stability issues with the Ollie. Will post installation thread after completed installation and testing.