I think there's a psychological factor. It doesn't take as long, and you're working with other people. It seems like it's all good, but when you get to the math, drive time, etc., well, ......... I'm not so sure. I always think about how "I" can be faster. If you're gonna do it, use one truck. I can sort of see how it would be faster, because you're only doing half the work, and you can recover on the drive to the next one, and be fresh.