Well, I used the heat gun and a plastic putty knife - but the stripes just shred. It dawned on me that maybe tape over the tape, then heated, might pull the old stripe off intact? I was working on the back....and since the stickiest, strongest tape I have is aluminum tape, I put that over the upper bunch of stripes. And it looked pretty cool! Since the middle stripe is in good shape, I put aluminum below that on the rest of the stripes. Ed walks by and says "Cool! That increases the conspicuity, too!" Hmmmm....
So for the moment, my camper is "chromed". I'll post a picture later. I figure the aluminum tape will oxidize and turn grayish - that's probably when I'll try to pull off ALL the tape. But in the meantime, it looks different :-)