Who has used this on their trailer roof? DIY? Professional? Alternative product?

I did an elastomeric coating DIY. The application process isn't that bad but you have to ensure that you do the prep work well. The only times I have heard of people that had issues rushed and didn't do the prep work well or didn't give enough time inbetween coats. I have seen the professional cost floating around FB, maybe it was the Kool Coat, and I saved myself hundreds of dollars doing it myself. I did a trailer renovation last year and got the folllowing read outs when people were asking about it: