I've owned a few trailers and have learned to take their recommendations with the roof seriously. At least with the inspection and re-caulking as needed. I clean as instructed, but probably not to the extent some do. I do not treat the roof per Alpha's recommendation, but would if recommended.
I guess what I am trying to say is that the roof on any trailer can become a huge problem so I would follow their recommendations.
Is your roof a Dicor EPDM?
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD