If you have a friend level 75 or higher, rooftop rumble gives a good payout
That is a very good one, so long as you don't have players act like richardheads and run straight on in, or throw loads of explosives (they tend to just blow up the package).
And maybe at a low-level you might not be too helpful if you just have a pistol.
You'll basically have to be in cover at all times, bar driving after the package.
One final thing that annoys me about that mission is the fact that it's called Rooftop Rumble.
It's not even on a loving rooftop? Who named it?