Helldivers Objective - Escort Convoy (Illuminates)
2With Illuminates, this is probably the trickiest fail-able objective as the Obelisk wall can still one-shot destroy rather than stop (per latest patch attempt) if it moves too much into the space of the Obelisk wall forming ahead of it. That said in most cases it just gets stopped now rather than destroyed.
The biggest threat to it remains the Obelisk because it can stop it from moving while also blocking Helldivers movement and possibly off screen and hard to dispose so that the Convoy can resume its movement.
I personally favor the Orbital Laser Strike stratagem as my go to for sending after off screen exposed Obelisks because it will track and kill it efficiently. Just be careful it doesn't come back towards the Convoy chasing other enemies to kill and get your Convoy destroyed.
I wish options like the 'Sledge' Artillery Strike would target an Obelisk over other enemy types but it only targets an Obelisk if nothing else is left. Other good options are Hellfire, Strafing Run, and Close Air Support if you can through them off screen in general area and hopefully hit the Obelisk.
Use of LIFT-850 Jump Pack will help your squad stay together and with the Convoy in cases where the Obelisk wall cuts them off.
Support Weapons that lob shots like Obliterator and Rumbler or Perk Grenades like Incendiary that can be lobbed can also save the situations where you don't have clear line of fire.
Primary Weapons like Scorcher and Double Freedom are particularly good at taking out Obelisks fast. Perk Pistols like Gunslinger and Singe also take them out fast.
While engaging in battle, don't let Convoy get too far ahead or behind off-screen or it will fail automatically if not by coming under fire by other enemies. Practice good formation and try to keep all the enemies / fighting in your rear.