The body shop supply stores sell what's called an 'Eraser' that is a drill attachment tool that literally erases the stripes, decals, old trunk lid dealer stickers.
I've used this for years in my detail business and it works great without scratching or damaging the paint. You can only use it against metal.
Costs about $15.
If you try this, remove the stripe vinyl only and then go back with a solvent (NAPA cleanz-eeze) and remove the rest of the old adhesive. Don't try to remove everything (vinyl & adhesive) all at once. Use it slow speed on a drill and as you see how it works you can speed it up. It would take me about 40 mins. to remove both sides, as long as it's against a metal surface.