Keeping decals looking new

Our ROO 23SS is stored undercover 24/7, BUT...the rear decal gets the full blast of sun all day and was getting dry and brittle and generally looking tired. We ordered a new one, but were thinking of a way to protect it. The concept was to get a soft-backed (like a flannel) white vinyl and hem it to make it look better and be stronger. Put gromets in the corners. With the HTT we were going to use bungies to hook to the top latches and then long bungies to go down and around the bumper and hook back onto itself (like the PUGS). Then to add a small block of very soft foam or ?? to hold this cover away from the surface slightly so it wouldn't blow and cause abrasion. Does this make sense?? Meanwhile, we have just sold the ROO and will be removing the old decal tonight and replacing with the new one - $50. So now we have a TT and the decals are not placed where it's convenient to do this same thing. We also have a large window on the back. So.....we're rethinking this concept, but feel like we need to come up with something. Have even considered building a wall of some sort to go behind the TT to make sure both the decals and the window and furnishing are protected from this blast of sun, rain, snow.

We have never used the 303 that I know of, but sounds like a good investment. I'm assuming you just wax the entire unit with it, is that right?