Just solo'd this as a 50 rogue. Make sure you have 250 lockpicking (or the key) to open the doors. Above the ring of law, right before you head into the next corridor (the one going to the bridge), there is a safe spot on the lil brick edge where you jump into the ring. Unstealth, pop Noggenfogger Elixir until you get slow fall. There is a bloodhound or two right before the bridge that will detect you. Run towards the group of mobs, pop Evasion, Sprint, & Blind the bloodhound. Run across the bridge and about half way across, jump towards the little ledge/area the Rugged Traveler is in. & there you go. Very easy.
If it's still bugged for you and you're in a group, kill a dark iron patrol in the starting area so everyone gets the Wanted Notice. Then go through arena and clear to the bridge. Have everyone exit the dungeon except for 1 person and then jump down to him. It works when it's 1 person at a time with no one else inside. I've had it bug with 2 people in the party and full group etc. This is the only method that worked for me. Also, if you save the instance ID and have alts that already have the Wanted Notice, you can rotate them in as well :)