Joel White had towing in mind when he designed the Nutshell prams. He started with Norwegian pram designs that are ancient and well proven. Then he kept a firm wide turn of the bilge for increased displacement and just enough rocker so the stern is always well out of the water under tow and lightly loaded.

But I think the best feature is in the bow. From the bottom, the garboard planks attach to a stem(just like a V bow boat) and form a V shaped chest. This performs well both towing or rowing unlike some prams that tend to bury the bow transom.

It planes like the Dickens on steep following seas, under tow. In fact, the only problem I've ever encountered, is it passing the boat. This shot was running on a lot of wind, 30-35 kts, and steep following seas, and the dinghy is going about 7 knots.

The solution when it tries to run us down, is to tie a dock line to the dinghy painter and let it out. As it planes down a wave, the painter goes slack, drags, and slows it down.