Advice for pain in the service industry?

Hello everyone! Fairly new here, and also recently diagnosed with RA as of November. I work as a server for a catering company (lots of weddings and big fancy events) therefore I have to carry around a tray with lots of heavy plates/glassware/silverware/etc. I experience immense pain in my wrists that really affects me and I was wondering if anyone on here has any tips such as ways to hold the tray or stretches/things to do to strengthen my wrist to prevent pain or anything? aaagh!