when we finish off a big loan we are going to go for this, we have done some research.
there are many pro's and con's....
i know we would use it lots throughout the year and we would rent out to friends and make some cash back.
the big downside we saw (as said above) are the 'age' clauses... yes you could end up with a cheap 4-5 year old one but then when its 10 years old you have to get rid.
another big downside is they get cold, very cold unless you pay silly money for ones proper heating
again as above, there are waiting lists, the other option is the touring caravan 'left' at a site.
bloke in work has one and he is off every other weekend and loves it