The Bandoleer is an engineer tool that allows the wearer to carry an extra type of ammo.
The Tool Belt is gunner item that allows the wearer to carry an extra engineering tool.
Good idea, bad idea, don't know. Just randomly inserted itself into my brain.
The results would be:
Gunner with Tool Belt- 2 engineering tool, 2 ammo types
Gunner with Bandloleer- 0 engineering tools, 4 ammo types. (-1 tool, + 1 ammo)
Engineer with Bandoleer- 2 engineering tools, 2 ammo types. (+1 tool, -1 ammo)
Engineer with Tool belt- 4 engineering tools, 0 ammo types.
Pilot with Bandoleer- no engineering tools, 2 ammo types.
Pilot with Tool Belt- 2 Engineering tools, no ammo types.
Wearing both items would obviously cancel out.
So, we would create two equal 'classes' with 2 tools and 2 ammos each, a dedicated gunner and engineer, and some interesting options for a Pilot.