Newbie a little nervous about driving a class a

As far as what roads are good to go, US Highways haven't been on one that wasn't ok to take. State roads good for the most part, if not they will warn you well in advance and give you the alternative route. County roads some are good others you can run into problems. If headed for a RV Park I always check the directions from the park website they know the best way in. Want to be safe pop for a truckers atlas. DO NOT TRUST YOUR ADVERAGE GPS there is one for trucks and rv's.