Hi Welcome to the forums! I have never owned a Denali, but the ones I have seen are nice.
I would treat it just like any other RV purchase today. Do your due diligence! Make sure you have a good dealer that will work with you, do a thorough inspection of the unit BEFORE you sign on the dotted line, then have them repair the items on the list BEFORE you remove it from the lot. Easier to get things done up front rather than later.
Aaron