stiffened quite a bit by putting foam pedestals or struts between the thwarts and the bottom of the boat.
And we tend to assume that composite boats are stiff, but there can be exceptions. If you don't know the maker, I would want to have inspected their boats. Making a composite boat both light and stiff is a real challenge. The better makers today are using foam core bottoms, but those are hard to repair, and have been known to snap when a loaded boat is pulled over a log. Souris River uses ribs, but I've read reports of apparent fatigue damage. I have a Millbrook ww boat that has sides as thin as cardboard, but the bottom is stiffened with Spheretex. Probably better than foam core for whitewater, but not as light.
Selecting a composite design with a significantly curved shallow arch bottom, and with curved tumblehome sides, will provide a measure of stiffness and perhaps allow less cloth to be used in the layup.
2-3 Canoe/Kayak Trailer
YakCatcher Rod Holder
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