We carry two, a SuperMAX on the bow and a (big-ish) Fortress, usually dismantled and stowed.
I'd likely carry one more on the bow different style from MAX and Fortress, if I had an easy/elegant way to mount another roller. This as a faster hot spare, and also in case different substrate encountered along the way rears it's ugly head. OTOH, so far we've never been faced with substrate the MAX won't grab in.
-Chris
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South River, Chesapeake Bay
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