We have a 2008 3000RK. Keystone sent us all new graphics back around 2012\2013 when they all started peeling, under warranty.
We had all the same issues and tried several approaches to remove the old graphics. Here is the method we used for the easiest quickest results.
1: Heat gun and remove the old vinyl. Care here will help to get all the vinyl in large pieces. The mountains were hardest.
2: Spray the residue with the linked product and let sit 60 seconds.
3: Buy plenty and a variety of plastic scrappers. Apply more heat and scape off the glue residue in a nice smooth motion. Have plenty of those blue shop towels on a roll. you will need them to wipe the glue off the scraper. Spray a little product on the scraper as well to make it easier to wipe the glue off.
4: Spray again and wipe the fiberglass clean with a shop towel. (Ours was Gloss Gel Coat)
It helps to have two people working together, One with the heat gun and scraper and one with towels and spray. Also have a box or trash can handy to throw the towels and such in.
Rapid Remover from
http://rapidtac.com/
The erasers are a waste of time as well as the other mentioned products. 3M was poor.
It took us a long weekend to remove all of them with this method back in 2017.
I am finally putting the new ones on as we are trying to sell the rig. It is no picnic to put the new ones back on either!