I tried using heat on one side and one side without. I definitely think no heat is the way to go. The tape peeled away and stayed in larger pieces than when I used heat. Matter of fact, I'd like to try this again when it is close to freezing outside to see how that works.
Now I just need to remove the 4X4 badge on the tailgate. Too bad the big ram's head is recessed in the tailgate or I would remove that also. But if I do, it would look weird like something is missing.