[RWD version 1 ] (I think that you will get the best version of the above maps by using the dropdown menu on the upper right corner and choosing CycleMap...For parts of Northern Ireland, it simply shows things more clearly)
I took a long hard look at Trostan "on paper" and decided that an Arderin that was also a County Top was worthy of some respect. The notion that I would enter a green tunnel through the forest, and come back the same way, did not appeal to me at all.
I parked at an old forest entrance that is now fenced off with barbed wire (at D19269 22023). It is clearly no longer in use, so I can't see how you would be interfering with anyone or blocking them. There is space for a couple of cars there. The idea was to go around the forest rather than through it and in view of what I subsequently discovered I have no doubt that I did the right thing. After a short walk along the busy road, I turned left and headed up just outside the fence separating the trees from the open mountain. You need to stay close to that fence for a while, at least in wet conditions, because there's an amount of swampy land at the base of Trostan, but the edge of the fence will save you. The ascent is easy enough too, over a series of rises. The bare moonlike summit is protected by a ring of peat hags but nothing that will bother you. All in all, it was an easy enough climb. You must ask others to describe the views. I was in cloud and saw nothing so hopefully some day I will return.
At the summit I said to myself - "Leave aside your prejudices and gallop down that forest avenue and you'll be in the car and on the way to Slieve Croob in jig time." I sauntered happily down to the forest and entered the narrow gap in the trees as directed by The Moyle Way signs. It was like a cross between Jurassic Park and The Hills Have Eyes Part 2. How those decrepit trees manage to remain upright when their roots are stuck in some class of green soil-less treacle I don't know. I regularly doubted that I was following the correct route only to come across another Moyle Way sign. I was so glad for my glasses as I had my eyeballs in line with sharp horizontal branches of eye gouging potential on many occasions.
If I had simply strayed into the woods muttering to myself and drooling I would have had no one else to blame. But it appears that The Powers That Be INTEND to lead the unwary into the swamp, for they have created this monster, The Moyle Way Shame on them!
Listen, my friend, take my route up, and get down whatever way you want, BUT KEEP OUT OF THE WOODS. It's a sodden murky obstacle course that will dement you.
I have the height of respect for Helen Fairbairn and really enjoyed her talk at the Walking Ireland/Mountainviews jamboree in February. Helen told us that she is at her happiest on the higher ridges. Amen to that! She describes a linear route linking Sliveanorra and Trostan over the Moyle Way in her Northern Ireland -A Walking Guide. Even if I had the luxury of a second car, I would avoid that route except at the end of very dry summers. Be warned!

Here are the AA stats based on this site's computing:
No.1 Knockloyd.... http://mountainviews.ie/track/2883/ Ascent 369m Distance 4.4km
No.2 Slieveanorra.http://mountainviews.ie/track/2894/ Ascent 200m Distance 4.2km
No.3 Slievenanee..http://mountainviews.ie/track/2895/ Ascent 140m Distance 3.3km
No.4 Trostan..........http://mountainviews.ie/track/2896/ Ascent 325m Distance 5.8km

Total Antrim Arderins................................................................1034m Distance 17.7m