For tankers like me, true CON tankers, there are two skills missing from a real tank:
1- Being very, if not impossible, to push back
2- Being able to block 3 people at a time, 1 in front, 1 on each side, like a football linesman
And I think this could be resolved with 2 simple perks in the Constitution attribute:
At the 250 CON perk, make us impossible to push back.
At the 300 CON perk, make us able to block 3 people.
That would make a tank in this game play like a real one.
Food for thought.