Trundle is a very, very good jungler because of hies passive spell Decompose. Decompose doeas so he gets health from any dead enemy in 1000 range. He gets 2%/3%/4%/5%/6% of the enemies maximum health, monsters counts as enemies.

You can change Greater seal of replenishment for any physical seals of your choice. Armour penetration is good to have if you are up against a monster or champion with high amour like a tank or the baron.

PLEASE TRY TO REMEMBER THE JUNGLE ROTE SO YOU DON'T NEED TO PICK UP THE GUIDE AGAIN!
start with an vampiric scepter and take the blue golem and then continue to the wolfs and wraiths. Then move on to the two golems. Now you are supposed to have over half health and be at level 4, other vise go back to spawn and start buy your mercury´s treads by buying boots of speed. now it´s time to take the red buff and gang top and hopefully get one or two kills or assist. Now you can take any monsters in the jungle as fast as they spawn but try to take buffs as fast as they spawn when you reach level 6 you may take the dragon bot i recommend you to take it in level 7. it´s allot easier then. Now you can continue take any thing in the jungle as fast as they spawn but as before take buffs as fast as they spawn and give blue buff to the mage in mid and the red buff to the carry at bot.[