Andersons Thatched Pub is closed to Carrick on Shannon. Open nightly from 8pm until late. From their website:

Motorhome and campervan travellers are warmly welcomed at The Thatch. Park up right beside our traditional Irish pub and enjoy an evening of live music, local conversation, and real Irish hospitality. We offer safe, convenient motorhome parking just 3km taxi ride from Carrick-on-Shannon, making us the perfect stopover for exploring Leitrim, Roscommon, and the River Shannon.

Dog friendly.

Parking

Large gravel hard standing area beside the pub. Motorhomes and caravans welcome. No services except fresh water.

Costs

Free to stay if you show some custom in the pub.