My thanks to Tom & Fasthobie for the solutions! We did end up getting a short heavy duty extension cord to plug in both the refrigerator & the ice maker, then plug the cord into the refrigerator outlet (yes, the ice maker WAS on the GCFI circuit). No further issues with anything tripping since. Also, we replaced the 50 amp plug & sealed, so that the wires are no longer exposed.
So, thanks again for all your help! Next time we post, it’ll probably be some winterizing questions, if we can’t find the answers in previous posts.
Safe travels y’all!