As the mod page gives us the name and the id with an idea of the ammunition used (sometime)
It would be great to have the information that M2 is low caliber military even if it's only quoted "50cal' on the page. Or like that the BMP-2 is a water drivable device. Thanks and there is what I noticed:

BMP-2 (id: 408) : It float at 1/3 of his land speed and shoots 25mm ammuniton box (Don't know if it can be reloaded) in F2

US Bradley (id : 336 / 361): It do NOT float and have F2 as a 25mm ammunition turret, other sits are passengers.

US Abram tank (id: 363 / 338) : Do not float, 3 sits, uses 120mm shells in F2 and M2 box (Low caliber military ammunition can refill an empty M2 box) in F3

Stryker 50cal (id : 331 / /356) : Have 8 sits with F2 as a protected gunner M2 turret (Low caliber mili), this vehicule do NOT float even with his boat frame.

Stryker MK19 GL (id : 332 / 257) : Have 8 sits with F2 as a protected gunner Grenade Launcher turret (grenade box, don't know if it can be reloaded) this vehicule do NOT float even with his boat frame.

Rocket Artillery (truck) (id : 337 / 362) : Do not float, have 3 sits, F2 is an artillery rocket turret that uses 12x rocket artillery box (4x4 space taking) (Don't look like you can reload a crate as it vanish witht the last rocket)

AC-130 (id : 377): Is a heavy weaponized plane with 7 sits, F1 as driver and F7 as passenger. F2 to F6 are 2 miniguns (20mm ammo box for both) and 3 differents heavy guns (don't know the references) this vehicules do not float and is wide and long.

Howitzer Artillery (id : 604/605): This is a long range artillery turret, it do not move but have 2 sits
F1 is used to lock the turret like a car and F2 can use the turret. It do not float and shoot one by one. I don't have the ammo reference.

M2 turret (id : 600) : This is a M2 gun on a tripod that have 2 sits like the Howitzer, it cannot move or float and it uses M2 box that shoot low caliber military ammunition.

Osprey (id : 379) : It have the same controls as an helicopter, F2 is a gunner (can't remember the reference of the gun, M2 or else) at the back of the device and F3 is a 20mm minigun under the osprey, other sits are passengers.

Littlebird attack (id : 380) : Is a small and VERY manuverable helicopter that goes around 100kph, it have a rocket launcher ( 18x rocket tube ammunition) as F1 with the driver controls and F2 have a minigun 20mm ammunition. /!\ Switching to F2 may mess your camera, just restart your game to fix it /!\