I think i solve it. I've downloaded the link that QUIN1965 gave me [Only registered and activated users can see links. ] and now i'll just test it to be sure. At least it already apears on the "Change preferences > Planning preferences" the vehicle option.

Thank you very much to you [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ]

I'll send a feedback when i'll try it ASAP