Use any brand but UF, which seems quite popular. I have gone through 3 of them. Yes, I am a slow learner. One was on my 17’
Casita when I bought it. It went out at 3 years. The next one lasted a year and the third one is headed for the trash heap now, failing shortly after the warranty expired. The problem? In each one of them, the “up-down” switch failed. In the last two, the terminals on the switch had corroded and turned to dust (after only a year.) It’s probably what happened to the first one, though I didn’t check. And, no, the jacks were never submerged in salt water.