Rim is toast for sure. Now while you're at it get a SA XL drum brake in there, better with the dyno too.
Mine has 32,000 miles with 8,100 on tour with the total weight 290 lbs. Near half of these miles I had a useless POS rim brake on the rear. 100% safe and reliable.
Actually, in Vietnam my fork broke 3 times near the top. I then got a tandem fork. LOL.