1. Purchase from a dealer close to you - you will need warranty work.
2. Pick the floor plan/options you want - just traded up because we wanted a better floor plan for long term stays
3. Grand Design is supposed to have a good quality program - they were recently bought out (Winnebago Industries http://www.rvbusiness.com/2016/10/winnebago-industries-to-acquire-grand-design/) for that reason - new buyer wanted a builder that had a good QA program.
4. Make sure your tow vehicle can handle the weight of the RV.