12th Manitoba Dragoons, aka 18th Armoured Car Regiment, the Support/Assault troop (4) 10-man sections did not use Vickers, but had all the Browning .30 and .50 cals they could ever want. Each White Scout Car had (2) .30s and (1) .50 that could be dismounted. Plus the HQ Troop had some Whites as well.
Typically, the Support Troop was used in lifting mines and stuff like that. But I've seen a photo of one Support Troop posing with all their MGs. Unlikely, but in a pinch, they could become a very beefy MG troop. If they were actually up to strength [also unlikely], the troop could field (4) .50s, (8 ) .30s, and their (4) Brens!