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i) Good point.
ii) I have moved a good deal of weight forward as well, so I think it will counteract any weight aft. (interior is moved about 6-8 inchs forward, too a bench seat out of the rear for a lighter leaning post, battery, added rails etc.)
iii) Probably. I would imagine I would have to take another tank to the station, one with a funnel in it and pump into that, then transfer to the bladder.

I have a call out to a place on the west coast that makes them as small as five gallons. I wonder how many hundreds they will want.