I really like the idea of replacing the rear seat in my 97 Prostar with a custom seat/ballast set up. Assume I use a reversible pump and get a custom-made sac that fits the box I build. Here are my questions: - In some of the threads on this subject, I've seen people mention a vent hose. Would that be a requirement with a reversible pump system? My assumption would be no as long no air was introduced to the system. - Am I right in thinking the hose connections would have to be at the top of the sac? If they were at the bottom, it would seem the pump would have to deliver significant pressure to push all that water up into the sac. The only reason I'm even questioning this is that I've seen diagrams that show the connections at the bottom. Thanks.
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