Me and Blue and some of my gear in the 12' Poke boat and a whole additional Poke boat, stuffed with gear that was towed.  My friend Brenda and I took turns towing the "cargo" boat.  It slowed us down to around 2 mph and was hard work when pulling against a headwind and/or current.  Took us a couple days towing to figure out how long the rope should be and how best to pack/trim the cargo.  The cooler float idea would not have worked, not enough cargo room and not streamlined enough.  The bigger boat is in Florida this summer and should work perfectly for next year.  I'll be bringing that boat north when I drive back from Florida early in 2017.