I don't know if it's my truck you were mentioning, but I painted the whole truck in the dark green and then layed the lighter green on top.
I had one minor spot that lifted paint, but I found that wiping the tape with a rag soaked in mineral spirits as it was pulled off worked great.
Pull the tape at about a 45 degree angle and wipe the adhesive as you go.
I think the length of time the tape was on didn't help things either. Took about a week to finish off the two tone work.

4636867-2tone1.jpg (321 downloads)
I want to die like my Grampa, peacefully, in his sleep. Not screaming in terror like his passengers.