Title, mostly.
I haven’t used RoadTrippers since they started monetizing their service, and I don’t remember what it means to export the Trip.
Trip Export allows you to download your trip as a PDF or a GPX file. The PDF export gives you an easy-to-reference list of your stops, while the GPX export lets you use your planned route with compatible GPS apps and devices. You can find detailed steps on how to export here: Exporting Your Trip