They are? Bloody hell.

I can't understand how a great lump of plastic and metal can be compared to a horse and cart anyway. Surely the very physics of how a motor interacts with the substrate is different? Four powered wheels working at high torque and with a substantial amount of horsepower driving them will mean the very nature of that interaction is different; a horse is dragging a cart and a motor is powering itself and the transference of energy from the wheels of a cart to the ground will be considerably less that that of 4x4. You can't wheelspin a hayrick.