Hi folks, I made a motorization for the good old big Batman Tumbler,
if youre interested, seems to be the only one out there,
the instructions and details are here.
  full front suspension with moving swing arms (those big things in the front that hold the wheels, like in the movies) Power Functions servo motor steering system, nicely hidden so you won't see it through the windows or in the front what's more powerful than an L-engine and faster than a XL-engine? Right, two L-engines! This motorisation retrofit is fun! Differential for the back axle, with those big wheels you will need it all gears run stable, no cracking suspension for the back axis using springs of the same size as those pseudo springs from the original set a retractable roof (no separate roof parts like in the original) a few other small modifications to make it look a bit closer to the original and make it more sturdy not to lose parts while working very stable frame