I've finished my 4th season with the Revolution pin box...and I haven't ever felt it had a sway problem...even when towing across our Nevada open desert areas.
One thing to keep in mind for future situations is that the Revolution is a factory only installation, and can not be upgraded with any other brand due to its 10" base vs. the normal 11" base that is standard on other pin boxes. Been through that situation when a repair shop ruined my original Revolution pin box and Reese hitch. The Sidewinder is the unit that fits a standard fifth wheel base and can be used to upgrade an original factory pin box in order to reap the benefits of this unique design.
Just my 2cents....
Happy trails,
Larry