[scorpiomidget]

couple of ways around it

if you targetname the truck say as "mytruck"

you can do

$mytruck solid

or in the map add a clip brush around the truck (you can countour it to the truck if ya like, and let people jump in the back etc).

Use a clip texture from the common folder, like tankclip or metalclip

then you get nice bullet sounds when u shoot at it.