Don't tamper with the factory ID tags and if you own both trucks you should be OK.
One thought I had; Is both trucks the same other than the windows? Don't try to use a 1/2 ton ID on a 3/4 ton truck or vice versa.
1953 Chevrolet 3600 Fried Green T'mater (Vern) In the Stovebolt Gallery Caution: Political Statement Man who runs in front of car gets tired, man who runs behind car gets exhausted.