I've got two sets of (removed) Tough Dog shocks, with a whole lot less miles, and they've shown no tendency to move from their "compressed state"... I'm not sure that a foam cell shot will "self extend" like the typical "nitrogen charged" shock...
Somehow this reminds me of the scene in the movie “The Big Hit”, with the “Trace Buster Buster”…
Maybe the Wheeler’s bump stops are “Big Black Bounce Buster Busters” (not to be confused with the “Big Black Bounce Buster Sticks”)