I feel this works, but I've gone from no movement in my trucks to a medium tightness, so take that for what it's worth. Also, in sunny England, we have these ribbed/spotted paving slabs for the blind, and on occasion you can "tramline" through them and get your weight pushed to one side, which then darts your trucks into a turn. Shit scary at speed.
Irrelevant point, but I believe this is how slap works.