So I brought Trundle the other day and of course I started to do the trundle jungle because why not =]. Here is my basic build for him
Items
Starting items - Cloth armor 5x Health Pot
Wriggle's Lantern - standard jungle =]
Boots - Mercury Treads
Phage - wither build this into Trinity Force (dmg) or Frozen mallet (Surv)
Youmuu's Ghostblade - or if you going more survival just get The Brutalizer as cool downs are the way to go
Sunfire cape/force of nature - get either one first depending on team set-up
Warmorgs / Atmos impaler - want more surv get wormorgs want for dmg get Atmos
this is just a general item guide i don't go for all of them directly but all of the items work for the trundle jungle
Runes
Ad Quints
3x ad red
6x Arp red
9 x armor yellow
9x magic resist blue
Masteries
depending on what you like more tank go defensive more dmg gos offensive that easy really =]
Over all thoughts
Jungle trundle is superb as he is turns out to be a great off tank and damage soaker in the later game he can also turn a tank into a squishy and turn squishy's into nothingness =]