DGARRI, When I purchased my unit last year, it had Good Sam and a Camp Club decal on the top of the nose and rear caps. When removing those, I used a combo of light heat, to help loosen the adhesive, and plastic scrapers, when all else failed...finger nails. I tried at times applying Goof Off and other cleaners, sometimes it seemed to help.
Neither would just peel off without a fight,the Good Sam was the easiest. The camp club had multiple layers and had a layer simular to auto tag decals that chipped off. These were time comsuming.
I also have removed the smaller EXCEL decals from the side and rear of the unit. They were bad at the edges in some areas. All I did was apply a 'little warmth' with a heat gun (hair dryer will work also) and them lifted the edge and pulled back. To much heat caused them to tear. When warm, was able to 'roll' the finger tip backwards over the edge of the decal and roll it back onto itself to get in behind the awning rails. Went rather quickly. Just removed the minor amount of adhesive left with Goof Off.
Would assume you will be replacing the decals? I purchased the three small decals for about $16 each if I remember correctly. Rockin' is right, a full decal replacement would be about a $1,000. I have several of the larger side decals that are still holding its color and shape very well, just a nick in the vinyl or an area near a trim piece thats curled. Compared to some units I've seen, for an eight year old unit, Excel put quality decals on.
I will be replacing the small Excel decals soon, but the others needed to be wet sanded and compounded to remove the 'new' gelcoat look they left.
REMOVING DECALS
HOW TO APPLY DECALS
Hope something helped.