I went through 2 ADCO covers on my TT in 4 years.. They distintigrated in the sun and wind. Did not like their warranty. They replaced the first "moderate weather" cover when it ripped apart in 1 1/2 years with a 2 year warranty.. HOWEVER, their stipulation was I had to pay $100 plus freight and upgrade to their "all weather" cover with tyvek roof. It had a 3 yr warranty but they told me it would have NO warranty since it was a replacement. ( even though it cost me $100 plus $30 freight). That cover lasted 2 winters and fell apart again! So I am done with ADCO and went to a Classic Accessories ripstop nylon cover called "Sunshield" with a tyvek roof. They are more expensive ( this one was $450) but they have a 4 year unconditional replacement warranty. I has been on just 4 months, looks great. We shall see how it does!
NO QUESTION you should cover your expensive investment if you expect it to stay looking nice and not have expensive decals fade out !