I'm looking for POIs of all truck/rv stops in the US. These are places where diesel fuel, food, and other services can be purchased and that have room enough to pull your rig in for fuel.
Have you tried the POI factory? They have tons of stuff over there. I can't say they have exactly what you want but there's a ton of POI files by category. There's a very popular one called "rest areas" which lists all/most US rest areas and services offered there. There are quite truck stop categories. It's worth a look.
I would like to create a separate set of pois e.g. Campsites and would like to know how and where to save them so they dont come up in the "Custom POI's" folder. Do I have to save them as a GPX file and save them somewhere else? Any ideas??
The first way is separate gpi files (Only one level in "Custom POI's" find menu).
The second way create separate subfolders in main folder what you set as target for POILOADER (Thare are two level in "Custom POI's" find menu - e.g. Main Category (Campsite) and in this category you have SubCategories (West and East & etc.).