Any thoughts on one or the other? I am wanting to get a tank, just torn between the two. I do have equipment that I could use the refueling tank, and fill manually if I wanted too. I do like the auxiliary tank option and not having to manually refill the tank, but I would think getting out stretching would be welcomed. I guess I am asking because I am right on the fence available the two I am looking at. Both are within 100 bucks of each other. Auxiliary tank comes complete with monitor, refueling tank comes with pump, filter, and meter. Only thing I would like is the toolbox top, I want to store an auxiliary air system in it, but that is not a deal breaker, this rig is big enough for me to put it elsewhere. Any thoughts from those that have or are planning on having one? Thanks.