Hey John,
Sounds like you got an exciting campervan trip around the island planned!
As Cathaoir said, Camping Ireland is the place to look for campsites and their interactive map shows you where they are located. I also came across
Campercontact, which seems to have campsites, private motorhome stops and other spots where overnight parking is allowed.
Do you already have an idea of where you'd like to go and for how many days? We happen to have campervan
road-trip itineraries you might be interested in.
Talk soon,
Antoine