I too am replacing the Excella two color blue tape around our 25' Airstream.
After reading the above I was able to locate through searching "Striping Tape".
I found 8" wide by 36 yards. Skill will be needed to apply I am sure. But there is more tape than I'll need. At $18.88 per roll. I bought two rolls, one dark blue and one medium blue. Company sales person said they sell this to Aviation dealers for striping planes. That good enough for me!>
https://www.findtape.com/JVCC-V-36P-...e/p375/?tid=21 < Let's do this thing we gotta doo!