I hope it works out good and I bet it does make it more reflective=good.

I have used it on 2 different RVs over the years.

But too many cons IMO.

Adding weigh to your roof.

That adds weight to your trailer walls at the worst possible place(more top heavy). So then suspension works harder to control the added weight up top.

Then it holds more dirt and is harder to get clean. Then it's more likely to start bleeding grey stripes down the side of your trailer during rains.

Then I would worry about 100% adhesion and durability for when I am on top of my trailer roof cleaning it from mostly diesel deposits from long roads trips so I don't get grey stripes down my trailer. I use a pressure washer which would not be good for the coating. If it starts cracking you have no control where the water goes under the coating then.