De-mountable campers
 

I'm looking for any advice you can give. I've been looking into the De-mountable as a touring option for my Hi-lux pick up and can only see advantages. As I see no mention of these on this forum am I missing a massive drawback ? Also while I'm asking, though very popular state side they're as rare as hens teeth in the U.K. Where other than ebay can I look to buy a used one from ? Cheers Les.