Drilling holes in trailer roof to install solar: worth it?

I’ve done it on 5 rv’s......a very difficult thing to do, as I’m always afraid that I will not get the hole “EXACTLY” where I want it. I use a plastic electrical junction box to run the panel wires into, and use pvc from the junction box into the rv attic. The junction box is screwed to the roof, with a very generous amount of epdm roof sealant between the rv roof and the junction box! memtb