Don't monsters carry stuff around too?

[JesterOI]

Usually when a player gets hit by a STR decreasing effect there's a chance that they will become encumbered because of the amount of gear in their inventory.
Was just wondering if it would be possible to have monsters spawn with random "weights" in their inventory to simulate the effects of carrying around stuff, and possibly letting them get encumbered, sometimes, in addition to losing AB and DMG from a STR decreasing effect.