Can you use shared gear (either granted by an ability like Weapon Forges, riding someone else's wagon/chariot, or crewing a war machine) if it would exceed the discipline or property limit of your class?
Example 1: A 3rd level class purchases 3 war machines because even though the L2 class has the trait to use it (and can use a device with those properties), the L3 guy has traits to enhance it. If your L2 guys have Discipline 3, does the gear they purchase prevent them from using the L3 guy's war machine?
No. But they (lvl2 models) won't get the enhancement. The enhancement is applied when you equip the lvl3 model with it.