Ouch!
You must now race every Dodge wagon to regain your girlfriends respect.
Those Dodge Magnum wagons are pretty cool. I dig 'em.
All of that torque coupled to an automatic tranny means that you better be awake when racing those things. Weight means nothing if it has enough torque to get it moving (which it does as you found out).
Did you drop/feather the clutch at around 4K rpms or did you just do a normal street start? If the latter, try the former next time.