I was in a polygamous marriage for 28 years. I wavered for 3 before deciding to get married, despite not knowing anyone else in that situation (besides my co-wife, of course). The arrangement worked very well for me. I said I'd never marry again after my first husband. And if my second marriage would have been a "traditional" one, I wouldn't have done it. There were no young girl wives. We were all in our mid to late 40's at the time. There was no communal living. I had my place and my much needed space and they had theirs.
We were considered the ideal model for polygamy in the community. My co-wife and I got along, helped each other with projects and socialized together. We had a tradition of going out to dinner to celebrate each others' birthdays. Even her sisters invited me to their events and performances. I was apprehensive about entering into a polygamous marriage at first, but my family and friends came to love my husband, which wasn't hard to do because he was a kind, caring man who'd give the shirt off his back. May he and my co-wife rest in paradise.
About three years before I finally gave a definitive yes, I had read books about polygamy both by Muslim authors and a non-Muslim female author, I was surprised to find the latter. I can't think of the name of it right now though...it has been more than 3 decades since I read it.