Update: I've left the 3W in good hands. Visual inspection confirmed this was a bit of roller. After much deliberation I decided to drive up rather than trailer - I figured worst case scenario would be getting stuck on the side of the road. Fortunately I was able to drive it 2 hours without any issues at 70 mph today, but yes, will have to get the rollers replaced before my trip to CA. Fortunately they had them in stock so I hope to be on the road in <10 days.
Thanks all for the tips!
