Some very good advice here and I would like to emphasize do your homework and research. I would say it mainly comes down to what you can spend. I still don't think I'd ever buy new though.
I bought a camper last fall and just got through buying a truck. My camper was a lightly used one owner 2006 Laredo 25RK which had been kept under a roof most of the time. I just bought a garage kept 2011 Ford F-250 with 47,500 miles on it that is very good condition. My main reason for buying this old was that I could pay cash and not have any payments. I hate payments with a passion. It's very humble compared to what a lot of people on here have but I like it and it's paid for.
There really is no one size fits all way to buy your outfit. You just have to figure out what's best for you.
Moderator edit to re-size pictures to forum limit of 640px maximum width.