Judging by the names of the Tank types, I'd say it's just 22 Super Tanks or less. Here's why:
1. Super Tanks already has Ghost, Gravity, and Leaper (Jumper). That's already 3 crossed out from Last Boss Extended.
2. Lava Tank sounds similar to Fire Tank.
3. Bombard Tank sounds similar to Meteor Tank.
4. Freeze Tank sounds similar to Ice Tank.
In total, you'd only really need to add Quake, Dread, Lazy, and Rabies Tanks. The rest can just have their abilities implemented to their respective Super Tanks counterparts.
Now that I cleared that out, I'm actually going to make this as a small project for myself since I like this idea.
(I'm currently trying to make a Super Special Infected plugin based on the Super Tanks)