I don't find the tripod stool particularly comfortable (got a couple of different one's stored in my shop).  Here's my camp stool solution.

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When traveling, the folded Coleman (Rambler II) stool stradles the tractor seat in my Prism and is lashed to the thwart just behind the seat.  I did purchase a tractor seat for the canoe for extra back support.  That's what sitting on top of my stool (and strapped to the legs) in the picture.  (I mean ... I COULD do without such luxury, but why?  Nothing quite like being able to lean back and watch the evening campfire in comfort.)  This particular model has about the same load capacity and weight as the tripod model and typically runs under $15.00

dd