When you are planning a new trip/route, you will be asked if you'd like to start with a "blank" trip or a "recommended" trip. 

Blank - this is a trip that will get you from point A to point B with nothing populated at all so you can choose all your stops along the way and build the trip from scratch.

Recommended - this is a trip that is built for you, based on the information you have added (like drive time). We add recommended campgrounds to the trip at intervals that suit your requirements, if possible, so that you have a base to start with when planning your route.

You still have the option to change any pre-populated items, but the idea of the recommended feature is that you have a base to start with and can go from there. This option is nice if you've never used Trip Planner before, if you are unfamiliar with an area where you are traveling or are simply new to the idea of camping.