Converse with fellow players
No clue if you figured it out as both your posts have been deleted but I figure I would at least give an answer as I encountered the same issue at first. Luckily it was just a case of me being dumb, but you basically make sure that two of you pallets have weapons on them and then just switch between them. Should be able to easily do that in the lobby. Probably the easiest client order, but i didn't bother paying attention to others so idk.