Before you buy, listen to this guys podcast. It's maybe 10 minutes long, he's a lawyer, and it will give you a lot of insight into things to look out for. https://soundcloud.com/stevelehto/dont-buy-an-rv-ep-45
BTW, the Canyon Star is a darn popular model, but you would be VERY wise to have someone who knows rv's check it out completely and thoroughly.
Be sure you check all of the walls... just press your finger tips into the walls all around, including in the slides. If there was ever a water leak, the wall will feel soft or mushy.