We usually recommend getting a survey first before plunking the money down, but in your case it sounds like you got a good deal and are willing to accept some risk with that. Can't tell much about her condition from a single photo, but she sure looks nice!
My only other comment is to make sure your truck is rated for that much tow weight (don't forget to include weight of trailer). It's not so much the pulling, as it is the stopping.
Best of luck!