Yeah, I know, a well placed sticky is all it takes to do it in, and those big windows don't do much to stop bullets... but has anyone tried using it to annoy other players? It actually works pretty great.
All you do is wait and watch their activity. If you get the opportunity to, drive up at full speed and ram the side of their car, and they will launch off the road, flipping uncontrollably for a good distance.
It's extra fun if you catch them on an elevated expressway and drop them to the ground below.
The weight and strength of the Dubsta 6x6 means that not much is gonna slow it down, the least of which are the supercars and stuff that most players drive, so you can really launch some of them if you hit them right. It's also fast enough to outrun anything less than a sports car, and you can play cat and mouse with faster cars if you're able to maneuver the cumbersome bastard well.
If you haven't tried it, and you own a Dubsta 6x6, I encourage you to give it a go. You'll have a lot of fun, and it's not a major form of griefing as you're simply annoying other players at most. Best way to do it with the most success is to shoot for slower vehicles or parked vehicles. Make sure the player is IN their car, if you want to catch them off guard. You can always go off-radar too, that adds an entirely different element of hilarity.
If someone could do it and film the results... that'd be great. Give it a try, it's fun.