There is great variety in the dinghies used by cruisers and what you can sell may be influenced as much by price
as anything else.
To list common types:-
7' - 9' fibreglass - not common in the US but very versatile as a small rowing dinghy. Are they made in Mexico
7' -9' roll up and air floor inflatables. For all the criticism of PVC a PVC dinghy could be one third the price
of "hypalon". These dinghies do not row well.
~9' aluminium - if stepping out across the Pacific or running ashore over coral
these are the bees knees. Not common in the US.
7' - 10' RIB
, PVC or hypalon, fibreglas or aluminium base. These are the cruisers favourite. With an 9.8 - 15 hp outboard
they look to be fast and fun to run. Much heavier than other dinghies.
If you have a friendly sailmaker
or similar they could make "chaps" or covers for inflatables. Other accessories include wheels, nav lights, small anchors and oars.
The other "need" would be for motors. If you could source a range from 2hp up to 15hp for fast delivery
at a good price they may be well received. Two stokes give more power than four strokes of the same weight and may be cheaper for the same power. My experience has been that 2 strokes ranging from 3 - 8hp are insufficient to get a dinghy on the plane and are heavy. Either small and light (2hp) or with enough power to get up and plane (9.8 -15hp) may be desirable. Check what the manufactures max power is though.
Some places sell a complete ready to go package.
I'd be guessing that a typical customer is going to want a dinghy right away. A cheap
PVC and small motor
and they're good for a year or so. Check what warranties the manufacturers offer.