I had a great time on a trip in Idaho last summer where we brought 4 sixths of Ninkasi
. We just used a standard keg pump (the ones you used in college) and kept the keg in the water when dispensing, and tucked along one of the side tubes when in transit.
Logistically, it worked great. Super easy, not that much space, and the empties weighed less than 10 lbs. The shape is the sixth barrel kegs is great:
The long and skinny shape is easy to pack on a raft.
As for the economics, one of the guys on the trip sponsored the beer and didn't bill us, so I can't comment on the cost.