What is your experience as fellow MC's in this regard?
I say: "AWESOME!"
The more "stuff" the PCs have to rely on, the more stuff you, as MC, have to work with!
"Who maintains your vehicle?"
"Who do you owe a ride?"
"You're low on fuel, if you dump one of your passengers you'll be able to make it to Nu-Castle, but probably not if you keep all three... what do you do?"
And when players are zooming around the wastelands it lets them meet all kinds of people! As said above, without "No Shit Driver" there's no mechanical benefit from having a vehicle... but there are tonnes of narrative options and opportunities and chances for fuckery! The non-Driver players are giving you a
gift!Remember, you're a fan of the PCs, you
want to see what they do with their toys!