Very difficult to have a boat small and light enough in weight to be readily trailerable [say 25 to 28 feet Length Over All, approximately 2+ tonnes] and towable by a large heavy duty vehicle, [think a full size pickup truck or full sized SUV such as a Chevy 2500 Suburban] and also to provide for tall standing height. To be readily trailerable, the mast
needs to be easily stepable and stowed.
A swing keel eases trailerability and opens shallow water
/ shore / beach access and avails the limited depth
required for most boat trailer ramp
accesses, but does require structural intrusions to be housed into the cabin sole
A transom mounted outboard engine
mitigates against taking up limited hull
occupancy space of a small inboard engines which are inherently installed with very cramped access and are noisy below when operating.
The standing height will be limited in any case towards the center of the salon
area, not in the V berths and maybe not in the head
or over the side galley
because the side decks and foredeck intrude into the house space and are not as tall as the raised mid deck
house structure and of course the entire area under the cockpit
of a small vessel is crawl and storage
space. Meaning that most of the underdeck part of the boat will be of low height.
There are boats with pop up decks over the salon
area which pop ups generally can be deployed when at anchor
or in a slip but are not generally suitable or safe for having raised when making passage
except in mild conditions, and are disadvantaged when the weather
is inclement as they open to the air, bugs and dew and rain enter. Some pop ups will interfere with keeping the boom held down but the pop up works when motoring or not sailing. Since the pop up is actually the main deck
of the house structure it can be quite heavy and challenging to raise.