I received the following information from the Tourist Information office in Killarney -
"The Ring of Kerry is generally a safe place for Campervans to travel in. When driving the Ring of Kerry, all long and large vehicles must travel in the anti-clockwise direction, starting in Killarney and going to Killorglin, Glenbeigh, Cahersiveen, Waterville, Caherdaniel, Sneem, Kenmare and back to Killarney.
All Wild Atlantic Way Discovery Points have designated Parking Points and Campervans can be accommodated. However there are often narrow roads that lead down to some discovery points, which can be unsuitable for larger vehicles.
My contact is not aware of any specific restrictions, but there are signs that indicate the limit of Vehicle Height and Weight where it is applicable.
There are 12 mainland Discovery Points on the Ring of Kerry. There is a narrow road which is the R566 route that connects Portmagee Village to Ballinskelligs on the extreme western part of the Skelligs Peninsula on the Ring of Kerry. The most spectacular scenery on the peninsula is to be found in this area and buses do not travel along this route."
I hope you find this information useful whilst making your travel plans.