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Trunion invention makes artillery more mobile.
—In-game description

Trunion is a technology in Age of Empires III that can be researched by European civilizations at the Arsenal once the Advanced Arsenal Home City Card has been sent. Once researched, it increases the speed of all artillery by 15%.

Arsenal technologies
InfantryInfantry Breastplate · Counter Infantry Rifling · Socket Bayonet · Flint LockA · Paper CartridgeA · Military DrummersA
CavalryCavalry Cuirass · Ranged Cavalry Caracole · PillageA
ArtilleryGunner's Quadrant · Heated Shot · Professional GunnersA · TrunionA · Incendiary GrenadesG
A requires the Advanced Arsenal Home City Card
G only available to civilizations with Grenadiers
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