TDM Dammage

Hi everyone,
I created a server darkrp which I install a car dealer npc but many problem arise to me,

The first is that cars can’t have dammage and destroy

The second : I can’t put the tuning and the passenger at the same time, I have to choose between one or the other.

Here, I am ready to answer your questions but I’m really a beginner in codding.

And I’m sorry for my bad english because i’m french ^^

Thanks for all answers.