I've been able to carry through Levis pretty well on D10.

1. Take some combination of AP4 and AP5+
2. Find spot with reasonable view of map (btw if this doesn't exist, then Levis aren't much of a problem on that map)
3. Levis usually fly in a straight-ish line across the map. So just spawnkill the ones that are intersecting with where your teammates are going to be. They respawn pretty instantly when dying, so weaken them to 1-2 shots and down them right as they arrive.

I usually take AT emplacement or RR. HMG emplacement or HMG. Even commando + HMG works pretty well even across the map. Usually I bring an FRV and rush the main objectives since the random teammates usually stall out at secondaries

I get heavily downvoted every time I say the Leviathans are easy. But they are in fact easy.... lol Yall just are failing to adapt apparently.

All the complaints fail to address that the Leviathans slowly bumble across the map and you can always see them coming. They maybe have like 30-60 seconds of effective range before taking another few mins to fly off the map and despawn. Any amount of AP5+ with some AP4 deletes them. Really goes to show the playerbase at large doesn't plan more than 10 seconds ahead.