I use the aluminum Harbor Freight version of that rack to haul around my KE100. Use it on the back of my Astros, the Blazer and the Liberty. Haven't had any issues thus far. On the Liberty we do have relocate the spare because the rack doesn't stick out far enough to clear it.
I can't tell if the Northern Tool rack has anything anti-sway built into it. The Harbor Freight version clamps down on the sides of the receiver. While it does help, I go one step further, after the bike is properly strapped to the rack I run two more ratchet straps from the bike to the outer bumper mounts, which effectively eliminate sway. My bike is 250lbs lighter than yours though.