Well, I jacked the Horse up and assessed. Couldn't find a problem. Hub screws tight, woodruff good to go, hub itself is true. So either the rim is bent, or the tire is just "warped" - maybe the rim was always bent and I just never noticed? I'll be honest, riding around today and looking down at the wheel, I couldn't see it was untrue. Only could tell when jacked up and spinning the wheel and watching carefully, or when I was spinning in the snow. So could very well have always been like this. Just going to run her!
Thanks all