I've got a heavy duty double with an add-on tray (which makes for a heavy rack). I found that when I moved it to the 4runner (from an Ecohitch on a forester) the hitch didn't insert as securely/far in the receiver tube with the spare tire in the way.
What I do to make sure it's tight on the 4runner is give it one more turn with the wrench after bikes are loaded - I've found that snugs it up perfectly if I have a little side to side play.
What I do to make sure it's tight on the 4runner is give it one more turn with the wrench after bikes are loaded - I've found that snugs it up perfectly if I have a little side to side play.