Are these vehicles equiped with Geo metro engines?

[Cyanide]

Ok, i'm sorry but it really does not make sense to me that a harraser or any of the other lighter vehicles have such a hard time goint up hills. These are supposed to be assault vehicles. Real assault buggies have more horse power than an F350 diesel. Now maybe a tank can't go up them, but the quads and the buggys should be able to rocket up those panzy hills.