From my limited knowledge of the jungle role, I would say 
Trundle should focus more on counter ganking / counter jungling and objective control. He's a good duelist and his clear speed - as you mentioned - is high, but unless an enemy has already committed to fighting and the escape ability ( Lucian's Relentless Pursuit, for example) has been used, he's too easy to avoid/kite.
His teamfights should work similar to those of top lane Trundle: if someone's out of position, punish them with Pillar of Ice so your team can capitalise. If not, try to zone the enemy carries without taking free damage. Don't endlessly chase a Vayne if you aren't able to reach her due to proper kiting, simply turn back around to help your team and be ready to turn on the Vayne again if she feels like she's safe to move forward. Obviously this becomes harder if the Vayne is really far ahead / if you're behind and not tanky at all, but in any case Trundle simply isn't the sort of champion who excels at killing carries. His main job is to show presence and zone enemy carries away from the fight so they don't obliterate his team, not to kill them.
Having said all that, I think other junglers like Lee Sin, Kha'Zix etc. have an easier time in the jungle right now and I don't see a reason to pick Trundle over them.
Trundle should focus more on counter ganking / counter jungling and objective control. He's a good duelist and his clear speed - as you mentioned - is high, but unless an enemy has already committed to fighting and the escape ability ( Lucian's Relentless Pursuit, for example) has been used, he's too easy to avoid/kite.His teamfights should work similar to those of top lane
Trundle: if someone's out of position, punish them with Pillar of Ice so your team can capitalise. If not, try to zone the enemy carries without taking free damage. Don't endlessly chase a Vayne if you aren't able to reach her due to proper kiting, simply turn back around to help your team and be ready to turn on the Vayne again if she feels like she's safe to move forward. Obviously this becomes harder if the Vayne is really far ahead / if you're behind and not tanky at all, but in any case Trundle simply isn't the sort of champion who excels at killing carries. His main job is to show presence and zone enemy carries away from the fight so they don't obliterate his team, not to kill them.Having said all that, I think other junglers like
Lee Sin, Kha'Zix etc. have an easier time in the jungle right now and I don't see a reason to pick Trundle over them.
Thanks for your help Wayne3100, I played trundle a lot lately and found that his main goal like you said is to show presence and scare carries away from their advantage point in team figh. He is also a good duelist against other tanky champ and his pillar and slow are quite annoying.
If Riot is gonna upgrade his kit I suggest that they should focus on Tenacity.
If Riot is gonna upgrade his kit I suggest that they should focus on
Tenacity.
"There is the Hunter and the Hunted"
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Love
But
He seems... too slow for me, his gank is ok with a pillar, his clear speed and sustain is monster.. but lack mobility to keep up with this META popular champ like
Usually something like
Or I just have to buy
Yes, they are recently nerf... but still strong IMO.