MM motors are no good for 1/10MT use, but the esc is a little beauty on 4s lipo- just use an external BEC/ Rx pack to power the servos, and maybe a small fan.
I have been running my MM on 14 cells in my e-savy for over a year now without a single issue. as suicideneil said its the MM motors that shouldnt be used on 1/10 Monster trucks the shafts will just snap.