Collision between prop_vehicle_jeep and npc_citizens

Trying to get player-spawned vehicles based on prop_vehicle_jeep to collide w/ server-spawned npc_citizens. I’ve tried various combinations of SetCollisionGroup on the vehicle ent. Collision works out of the box against npc_combine_s Likewise, Scars-based vehicles collide with npc_citizens. I suspect its related to prop_vehicle_jeep default physics and/or the point-entityness of it, but I haven’t found the silver bullet. Any insight would be appreciated. Thanks.