When I brought in mine in 2007 it was liable for 13.3 % VRT on OMSP. As previous poster said if the unladen weight was over 3.5 tonne then it would be €50 to import but I would verify this with revenue with all the recent changes to taxes before importing.
Also bear in mind that a 3.5 tonne unladen is a big camper. Mine is 5 berth Hobby AK620, (average sized camper, 6.2 m long ) and it weighed 2560 KG. Good luck and happy camping.