Installing cadillac taillights isn't too difficult if you have a little experience. It usually involves some cutting, sanding and welding to the back of your vehicle.
You should be aware of whether or not your Caddilac Taillight Conversion kit comes with a backup light. This could cause you trouble with the local law enforcement.
You should check with your local DMV, but unless you do not install back up lights, this custom option should not cause you any trouble with the cops.
You do need to be careful when modifying your car or sport truck as some mods can cause the police to harass you. These mods usually involve windows or lights but sometimes bumpers and wheels as well.
Since you've added a cool rollpan, now you might replace your taillights as well.
You can substantially upgrade the image of your truck with replacement caddy taillights cut right into your tailgate or use caddy buckets to make your truck stand out.