Hi xandra.
While all the spots on the usermap are provided by locals in that area with all the knowledge that brings, there's always an element of risk anywhere and it would be wise to apply common sense. I'll sleep anywhere but my wife prefers to only go where there are other vans parked. Ultimately it's your call but in 7 years of camping we've never had any hassle.
On the barriers, I always check out a spot on google maps if i'm going to be driving a bit aways but that's no garauntee as it's out of date. You could always ask about a specific spot on the forum here and someone from the area will know.
There are tons of wild spots in Donegal, camped in a few some years back but can't remember the names. I know they were up around Portnoo. too many hills for cycling though
I'm sure some locals on here can help you out.
Anyway, wherever you end up...have a great weekend
