I found this quite interesting... Extending caravans in the 1920s...pop tops in the 30s etc. shows the latest ideas in caravans aren't so new...

http://www.oldclassiccar.co.uk/classic_caravans.htm

The units are still the same principal, just the fitouts have changed.

JC.

I find things don't really change just get better even caravans

love my c/v