Trailing a boat - rules of the road tips

Are there any specific rules that must be adhered to when towing a boat on our roads and especially motorways?

Do I need a braked trailer etc?

Any info is appreciated as this may be the first year I venture forth with the boat to greener pastures!!

You'll find good info in the trailer section of www.rsa.ie

Make sure your licence allows you pull a trailer.. see this http://www.sea-angling-ireland.org/bulletin%20board/viewtopic.php?p=165696#p165696

Steven