The forget do you hold that thing :I
well the do make lighter versions and that's the whole point, it's hard to lug around which makes it basically impossible to shoot when just holding it so you have to deploy it or else you're screwed
also it could be modified to have a lightweight bipod on the front instead of that massive tripod
edit: i looked on wikipedia about the gun, it weighs 33 pounds without the tripod and 50 pounds with one and it has a 3 man team running it
i think the team works like this
1 guy for shooting the gun
1 guy for helping with reloading and changing the water
1 guy to cover them when they change positions
edit: landmines and/or tnt would be great