I have the 5s 4000mah 20-30c lipos, I busted my tranny twice before I could run them down fully- mucho power there...
If you gear for no more than 40-45mph, then both lipos and motor will do excellently, but it depends alot on weight and gearing- your lighter truck has me at a disadvantage, so you should get better results and not need any cooling down breaks for the motor.