I like the idea of Thornmail, but having no alternative in your build is kinda on the downside. Maybe have an alternative of sunfire cape/banshee veil/Force of Nature, just for opponent teams. Maybe have a list of luxury items on the side for long 3v3 games, if they ever come along.

Ahh sorry didn't see that :P. To put an icon in your guide, you type: [.icon=doran's sheild.] Take the periods out of that, and you will get the little icon. To make the size bigger, you type [.icon=doran's sheild size=40.]. It works for items, champions, abilities and summoner spells.

Read the bottom of the skill sequence chapter... lol. Could you by any chance tell me how to get icons into the guide? Like item symbols/skill icons.

Looks good, I havent played Trundle in 3v3, I mostly do 5v5, but this build looks like it would work well. One suggestion, I try to max out Q pretty fast, usually works wonders for me. I just get one point into Pillar of Filth to have it, but wait till later to max it out. Just my 2 cents. Overall a good build, I give it a +1