Rocket RV episode?

Right... having to take to reddit here because i've scoured all over google and found myself unable to find this.

I very distinctly remember watching something on Discovery Channel, and i'm pretty sure it was Mythbusters, where they tried to stop an RV (or something similar, slight bit foggy in my mind) with rockets, though to my recollection one of the rockets went off early and they had to stop there. But i can't for the life of me find that episode back - i've thought of the fact it couold've been on Brainiac instead, but i've drawn blanks there too. Any devout fans here who coucld help me out?