The usb port in my 2017 still seems to be working fine, but again I just got the trailer this summer. The previous owner only used the trailer 2-3 times in the three years he owned it. When/if mine fails I will look for a quality replacement. Mine has the two outlets plus the power point to plug something, like the backup camera monitor, into.
It's also obvious by reading the replies that a lot of people who posted suggestions are people who use their trailer hooked up to shore power. I wish Icould use some of those suggestions, but I don't feel it would work well to fire up the generator to get ac to run those plugs just to charge my phone.
2017 Jayco Jayflight 29RKS
2014 Ram 1500 Crew Cab
Weimador Daisy Mae (Gone, but will always be loved and missed)