My only problem is with the limited distribution of CG. I'd most like to find them along major travel routes--Interstates and major highways. So that when we travel cross country we can find one every 300-400 miles. I don't care about the CG being old and often a bit run down since we aren't going to hang around a CG during the day. We are off doing things in the area or just want an over night stop.
Try plotting out a route and see if you can find PPA CG along that route would be my suggestion. On the other hand it isn't a major expense and you might just get it and see how it works out.
I see there is an Android PPA app that might make it easier to find CG.