You will need another Human to play Ranked Multiplayer so grab a friend, your friend can just sit AFK or farm kills.
Load up Cold War Beach using "the fuzz" vehicle. (DLC Needed)
If you do not have the DLC, the Space Cowboy or Nucloid can also do it but be warned Nucloid's handling can have a mind of its own sometimes and you can easily tip over.
Now comes the first RNG part, you need a clean start where the bots won't hit you after the first barrels, once you get a clean start and you're out in front the second RNG part comes into play.
BOOST(green barrels) spawns. These are random.
If you get lucky the BOOST barrels will spawn nicely for you. Don't go too far out of your way for boost as this can do more harm than good.
It's really RNG in both the BOOST spawns and how clean your start is.
It took me 6-7 tries but I got it my first time using "THE FUZZ" vehicle.
Good luck