Looking more closely at the photo of your camper with the taped window, that may not be the tape I was thinking of, which is translucent rather than white. It still wouldn't look top flight on the tan though, I agree.
Not being sure how it would look on my older white roof is one reason I haven't put the tape on mine yet, though I bought the tape two years ago during a sale. It's also the kind of thing one wants to be sure and get on straight and even, and it sticks so well there's no room for error. Intimidating, in a word.
A couple of others here have put the tape on their campers and I guess it has weathered well, in case you ever decide to do it.
It's never too late to have a happy childhood!
Lee, WU0V, and Courtenay, N0ZDT
2011 Rockwood A128
2000 Silverado 1500 pickup
60W solar system
2000W inverter generator