Chances are it isn't a "font", but rather a Computer Generated Image (CGI). A shop that specializes in vinyl wraps probably has the capability to duplicate the Grey Wolf letter imagery from a photo.
'07 K3500 Silverado LT Crew Duramax (LBZ)
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"