Hi - myself and a friend have decided to buy a mobile home in Wexford and spent several days visiting sites, looking at mobiles etc. We found that as soon as we went in to a site, we knew if we would like it or not. I think there is nothing like just visiting and walking around. Not many spaces are available, but in a lot of parks, there are For Sale signs up. Also, some of the parks have mobiles for sale, new and second hand. We found in every instance that the current occupants of the sites were very nice and very willing to talk about their site and their mobiles, as we told everyone we were new to this.....we met several while walking the beaches.
We had rented a holdiay house for a week anyway, as we like a particular area, so we just surfed the web for parks, visited them and talked to the owners and some of the occupants, looked at mobile homes for sale, checked those out on the web too, made comparisons.
It was a very pleasant experience - good luck with your search.