Junglers in 3s usually make up their own paths, and they need good 2v1 champs like Galio, Maokai, Cho Gath, anyone like that. It's a lot more dynamic than in Summoner's rift, but Trundle is also a very good and scary top laner, but he's a bit more mana intensive in top lane, but has good HP sustain. He's a very good anti-bruiser considering his debuffs. Trundle is also realy versatile depending how he's built, he can build things like triforce atmogs to be a bruiser debuff tank, or he can build things like shurelia, randuin, and aegis of the legion to be an aura/debuff tank.