Well, I have a separate fat sack and pump to go behind the driver's seat. It is 500 lbs when full, and it is precarious sitting on the seat because it is so large. I usually try to put an ice chest up against the seat to double the width that the fat sack can sit on. You can buy a separate pump pretty cheap, although if you were really ambitious I suppose you could plumb it together with your existing sacs.
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