I bought 100' each of the Camco 3/4" wide and 1" wide molding. The 3/4" wide molding seemed a bit wider than what was on the trailer, so I used that.
It took a couple of minutes to get the hang of how to install the trim, but after that, the job went fast. So far it looks good.
Now I have to figure out what to do with 190' of RV trim...
I could have bought smaller quantities, but it was almost the same price!