Advice Please - Stopover Near Dublin

Cartledge

We are travelling to County Kerry on September 23rd, via Dublin Port with car and caravan. Ferry arrival time is about 5.00pm.

Would anyone kindly recommend a good, clean and convenient site, with toilet block, for an overnight stop, on or close to the N7, near Dublin. We would prefer not to arrive on site much later than 6.00pm so
perhaps 50 miles from the city would be reasonable.

Many thanks!

Peter.