Honestly I hadn’t thought about the starting equipment for a Behemoth; for the most part just disregard it since you can approximate the gear as desired. Unless you specifically want the flavor of Behemoth Barding you don’t even need to take the chain mail unless you want to.

The holy symbol is somewhat important unless you’re going for ‘Oath driven’ rather than ‘religious’ stylisms (which is fine, if so just reflavor it as a symbol of oath; like an oath of conquest might have the Clawed Amulet of Tyrania as an example).

The various packs can all be explained as having pouches in your body to function as backpacks and whatnot; why shouldn’t a Behemoth be able to carry things, after all? Kangaroos can, fantasy chimera nomads can too.