I tried plugins like damage control, modular car damage etc. and nothing works. I need a plugin in which config I can set max possible HP for every modular car module (cockpit, camper etc.). I want to increase max hp for my server so cars are harder to destroy. Didn't I find a plugin or can anybody create it? 

In 2 words - you can't do that in easy way. If module health is 100 for example and you will set max 200, after you repair it over 100 it will seem like broken. Maybe there are backway around that, but in general there are no simple solutions. You can modify damage and other stuff, but thats not the best way