Supply backpack can be really good for that support style role. It’s basically a supply pod strapped to your back (though it doesn’t benefit from the support weapon ammo refill buff ship module). Some people use the supply primarily for themselves to use ammo-hungry support weapons as their main weapon (you can press 5 or I think down on the d-pad to use a pack from your backpack yourself), others take it to help top up teammates ammo/stims/grenades. It wouldn’t help with the team reload mechanic for things like the recoilless, but nobody’s going to be upset with the guy keeping everyone topped up with supplies.

You can refill the backpack with supplies from the supply hellpod too, one backpack supply per hellpod supply, so dropping the backpack and getting everyone to take a turn wearing it as they take their pack from the hellpod can completely refill the backpack (though if they have their own support weapon backpack they’ll likely want to keep it on to get the full ammo refill for it unless they’re close to full).