Remove all of the rubber trim, clean the stainless of ALL glue residue, clean with Windex, polish to a nice shine and throw the rubber in the trash. My wagon looks much better without the falling rubber. I was going to put a wide black pinstripe, the same width as the rubber, back on to give the illusion the rubber was still there. Wouldn't have to worry about that falling off all of the time.
Buicks answer was to remove the wide trim and use sheet metal screws from the backside to attach the rubber.
