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I would recomend the Manfrotto 2983 Adjustable Background Holder Crossbar combined with some good stands. You sound like you will not need to use this a lot, so using or getting a pair of good C stands or medium duty folding stands that you can use for lights when you are not supporting a background should work fine. You can add sandbags to the stands to help with stability depending on wind. The special background cross bar collapses fairly short, and it does not need to be super strong because the tube of the background paper supports the span fairly well. The ends of the cross bar go right on to a 5/8 inch stand end, so you do not need to fight adapters or kludges to make it all work. You just assemble it with the stands low, and then two of you raise it up to working height. You still need a step stool or small ladder to un roll the background and put a clamp on, but it is all very practical.