i wouldnt park anywhere in limerick city if i were you. there is an aires in askeaton, about 15-20 minutes west of limerick city. its in grounds of the swimming pool. there is a campsite at curraghchase, again 15 mins west of limerick city. where are you coming from. safer not to stay overnight in camper in city. castleoaks hotel castleconnell, on dublin side now allows motorhome parking, thats about 20mins, also think you can park at finnegans pub on dublin road once u eat there, but check that with them before you travel.