:-?
I have a new challenge to solve...I am the proud owner of a 2 yr old Munsterlander Setter dog (adopted) who will add another 60 pounds to my already overloaded Poke boat kayak.  I've researched some plastic pods, made to pull behind kayaks, which seem doable but are also heavy compared to carry capacity.  So now I have ordered an Intex floating cooler (for tubing) which should carry 60 pounds and will try towing THAT with gear in it.  Dog will have to be in kayak with me.
It looks squarish and not too streamlined for towing so I plan to make a silicone-coated fabric "sled" to pull it on through the water which should help in making it slippery and I'll make a contoured, pointed front end on the "sled" to help make it more streamlined.
:D  Remains to be seen how this will work.  :o
Any other suggestions out there???