What you are contemplating is what I did for some time in San Diego
To compare space, it really depends on the boat. But to take a wild guess on a production boat I would say a 36' sailboat or a 30' powerboat. They both have the same voltage systems (12/115v) but the boat world is more technical.
If you take the best trailer out there and multiply the craftsmanship over many times, that's the structure of a boat.
The problem with boats is you just can't pull over to the side of the road. If something goes wrong or the weather
gets extreme one has to know how to deal with it on the spot or get stuck out in the water
. And that could be disastrous depending on the skill level of the crew and/or the quality of the boat.
The other problem with boats is keeping dry. Any cloth material will get musty if not aired out regularly. Metal objects have to be maintained, including stainless steel
are subject to corrosion
. Waste has to be managed, trash or sewage. Food/WATER storage
and use has to be monitored.
There are many differences but yet the same. The travel, sights and meeting people are synonymous. But depending how far you travel these can be completely different on a boat.
And last, with boats the spending of $$$ can be a shock if not prepared to dedicate whole-heartedly. It's like taking on a spouse............................._/)