I don't look at this as you being a backup or a guard for the covert mission we're walking into, nor do I look at this as us - me in particular - being a liability for the firefight we're walking into. I think it's more likely that the Campus is unsure about exactly what it is that we're dealing with, so they sent a mix of skills and talents to cover lots of different possibilities and scenarios.
As for the rentals, we shouldn't get cargo vans, they're way too suspicious. And we shouldn't get two of the same thing either. I would say, let's get one minivan (we can take out / fold down the seats), and one larger SUV. Neither one should be black. Maybe... one green, and one blue.
David exits the plane, and goes to the cargo door to start loading equipment into the van.