gcal said:
How about a couple? I have run into 2 people and 3 dogs in a fullsized van - they definitely felt cramped. I have run into a couple in a 42 foot travel trailer who felt cramped, too. DH and I do well in a 32 ft class A, but if I were alone, I would trade it for Roadtrek or a 21 ft Freelander. Could not do anything I can't stand up in.
Like most things, it all depends on the person.
I am 6 feet tall and otherwise a big guy. I can't turn a bed sideways in a van and sleep comfortably so an extended body van is pretty much a requirement so the bed can run length ways along the side wall.
I cook. Part of my plan is a big change in my diet and cooking and food prep is critically important to my health and budget. I NEED kitchen space, cook top, prep space, fridge.
Since storms happen I must be able to stand and do basic exercises indoors. Even if it's only sit ups, push ups, body bends etc. I have to be able to move about when weather restricts my movement otherwise.
I must have space to work, both computer based and craft based. I do IT and leather work. Work space will be a constant struggle of cleaning and putting away between projects.
I am currently looking at 14 passenger vans with a hi-top, short, and mid length school buses. I just don't see a pre-built RV lasting with me living in it.
Someone who is 5 foot 3, has no requirement for work space and who cooks very little could get away with far less space than me. If I had to come up with a calculation I would say as far as minimum need goes, 3xpersonal space. I would define personal space as a rectangle measured head to foot and about 1 and 1/2 times wider than shoulder width.