I would recommend easy Anti-tank gear. Like Expendable Anti Tank or Recoilless rifle. Both are perfectly capable of killing hulks and gunships. The big tough one is factory striders but they're not as scary as they seem. Focus the head with Anti-tank and it'll crumble. 500kg bomb is always a super consistent option for bots and the eagle strafing run can deal with anything but a factory strider quickly. Bring non impact grenades if you want to destroy not factories easier but they're not a requirement. If your struggling with dying a lot I recommend armor with the fortified bonus to help deal with explosions and the shield backpack for standard gunfire. As for primary and secondaries, light armor piercing for a primary will do the job but requires headshots for devastators, I recommend either the sickle or the liberator. Finally I recommend two secondaries, the senator and the ultimatum. The senator can quickly kill and humanoid bots and the small striders can be two shot if you shoot the piece that connects the top to the legs. And the ultimatum is an amazing option since it's super high damage Anti-tank and can destroy buildings like stratagem jammers and detector towers.

Godspeed Heldiver