The vehicles are tricky. You are disabling a creature or creatures to pilot a Vehicle, and that is card disadvantage. A Vehicle is like an enchantment, like an artifact, it's a card that helps other cards. Therefore, a vehicle needs to help a lot. If all you get is a small bonus, you are better off playing some other card. The most important clause here is 'until end of turn.' You have to take the momentum hit perpetually to pilot Vehicles. That means your strategy will work best with Vehicles if you play creatures you don't normally attack with. Walls with power and small creatures mid to late game, for example, are good pilots. The best Vehicles are the ones that are good artifacts. Cultivator's Caravan will help you with mana even if you don't pilot it.
All of these Vehicles are useless if you don't pilot them. Only Bomat Bazaar Barge gives you a card when it comes in. Otherwise, if you don't pilot them, they might as well be artifacts with a blank text box. That is something to keep in mind when adding these to a deck.
