I usually get cast in the heavy guns field, so I carry my 2000 and my XL. Obviously, I don't move around too much, and I'll only fire the XL if I'm out of water in the 2000 and retreating or I've found a good spot to set up the bipod. I always have some kind of Storm pistol with me too, just in case.
Heavy artillery + high ground = an easy battle.
Why else would they call me Leviathan?
"Artillery batteries, prepare to fire. XLs, dual aquastorm. Balloons, quick burst, short range. Battery commanders, FIRE AT WILL!"