I removed decals on a Sunline trailer we owned. I used a hair dryer and plastic putty knives. WD 40 was good for removing adhesive and there was little shadowing. It wasn't a hard job on my Sunline, but you never know. I would start with the smallest decal you want to remove and see how it goes.
Replacement decals may be available from the manufacturer or if you look on EBay, you may find something else you would like to us. Or...look at other sites for auto/rv decals. On the back of our Minnie trailer, we had a decal that was the NY City skyline....a little homage to my DW being from just north of the city and for our careers spent in NY state!
