I think that what you are suggesting would be a 17 ft "Vest Pocket Cruiser".

The "Vest Pocket Cruiser" is a sail boat that is easily trailerable, has a cuddy cabin for 2 adults or 3 very close friends, plus room for food, water, and additional gear to be stored. They are great for gunkholing over a weekend!!

The Sovereign 5.0 is an excellent example of a vest pocket cruiser with amenities.

Hunter makes a 19 ft hybrid hull (can be a motor boat or a sail boat) with many amenities for 2 - 4 persons.

My experience has been that a weekend is the max amount of time that MORE THAN 2 people can normally stand to be on most small boats.