Looks good. You mentioned a bit about needing sticking power, which is very true. I'd personally get just one more CDR item, so I'd suggest
Iceborn Gauntlet, as it fits both criteria. With SV, IBG and blue pot you have 40% CDR and pillar has a 1 second downtime. You can really do annoying things in teamfights.

I don't think you can get away with building both blade and hydra. I'd just stick with blade and settle for slower waveclear. I would think trinity force would be better than hydra anyway if you wanted more damage.
Also not a huge fan of the long sword start but it's okay. I'd start doran's shield unless im planning on stomping some melee champion in early trades.
Also not a huge fan of the long sword start but it's okay. I'd start doran's shield unless im planning on stomping some melee champion in early trades.

Thanks to Hoppermh for the sig!
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I feel
Anyway, I would like advice on my top-lane Trundle build that I usually run, as I am just about level 30, and haven't started ranked yet so I know I have a lot to learn and my build probably could use improvement:
STARTING ITEMS
This is my standard start when I feel safe or evenly matched in lane.
This is when I play against a champion that has a stronger early game than me.
GENERAL BUILD
Usually rush this since it is such an effective item on Trundle in my opinion. With the AD boost from your W and from the Bork, you can take a tower in one attempt with a full creep wave. I feel life steal is a really worthy investment on Trundle since you have a lot of health regen in general from your passive and it is all boosted in your W.
Pretty much the best item for AD auto-attacking champs, and again it has life steal. The AoE damage gives you an actual presence in team fights, and if you are fighting an enemy in their minion wave it allows you to kill the minion wave which lets you heal with your passive giving you the edge in a pinch.
Gives magic resist, health and boosts your healing even more with your W. Lets you become a tank.
Armour and health. Standard for a top-lane bruiser champ. Can be switched out for an early
BOOTS
Can pick
LAST SLOT
If I find that the game hasn't ended yet and I have time to fill my last slot then I try to adjust to the situation; another MR item, another armour item,
BUILD ORDER
I don't really have a set build order, but I like to rush
SKILL ORDER
R>Q>W>E is the general pattern I follow, as maxing Q can get it on a ridiculously low cooldown which lets you dual really well. Maxing W second boosts the healing and attack speed you get from it. 1 point in E suffices until late game since it is mostly utility. Usually get Q level 1, although getting E level can screw with the enemy jungle.
That's my build in general. If there things people want me to clarify, or if there is any criticism or advice people want to give please comment! I would really like some feedback to improve my build!
Thanks ^^