Plot hole: In a heist that started with 7 men, they only thought to acquire 2 quad bikes for part of their getaway, fortunately only 2 men reached that stage of the plan. (01:44:44)
Suggested correction: My understanding is that two guys were supposed to load the quads with the cash, then load the cash into the Prius and those two guys take off from there. We hear this being recited in the planning stages, which is being shown to us as the action is unfolding. He then says that anyone remaining is to take the pickup truck. They would have wanted to get the cash off site ASAP, so the plan was likely that the remaining guys get to the pickup truck on foot.