Once you go inside of a Flying J, pick up a little booklet (for free) that lists all of their truckstops all across the country. It tells you which exit they are at, how many pumps they have, how many showers, etc.
You can also go online to get the same information.
The same with Petro & TA truckstops. (I heard that TA has bought out all of the Petro truckstops.)
2008 Itasca Suncruiser 38T