Isn't this information on some GPS RV receivers, Trailer Life and other campground directories, state and federal campgrounds Reserve America websites, and of course campground reviews? Many TCers boondock and you will never be able to capture all that information. You are sort of re-inventing the wheel and have a bag of solutions to issues that are already covered elsewhere. Also, after you complete the effort in a year or two it will be obsolete as campground owners and managers change. Some new campgrounds will open, some will close. Good luck but I don't see the payback in value for what you are putting into it. I have never been turned away from any RV park or campsite because I have a TC and this has been going on for me since 1987 or so. Sometimes they were full and no vacancy but never becaue I showed up with a TC.