Gotta disagree... 3S and 4S is enough for monster trucks... Had LST run 3S 5000mAh and 7XL on Mamba Max esc.. it did fine... Those packs must not be performing @ 28C... Right now, Temporary, I have 4S running my 1/5th scale and 2280, just for fun....
http://www.youtube.com/watch?v=dV51RnoBrGc