As for steering servos in my xxx-nt I have a futaba s9405 which is a little overkill at 99.9 oz-in at 6 volts and .11 sec@ 60 degrees! I can hold the front wheels and turn the truck with the servo. As for the motor an O.S. 12 would be a good motor for the truck. Do not try to fit a trx 2.5 in the truck!
IT'S ALL ABOUT THE PAIN; THE INK AND THE JEWELRY ARE JUST SOUVENIERS