Whenever I see campers/caravans/trailers whatever they are called all I can think of is the cost of gas and my own hatred of driving. So, for me I'd rather spend the money on land, but I'm a bit of a 'stay at home' fuddy duddy.
These are like huge homes one wheels, I suppose when you found the place you loved (if that happened) you could just stop driving and ta-dah instant home. :)