I was traveling on a secondary road, heading for the Essex ferry in NY. I was riding in the pouring rain, probably between 35 and 40 mph. I was pulling my trailer, as I was heading home from a trip to CO. The front tires on my Spyder are new. In an instant, the front of my Spyder swung to the left. Felt no connection to the road. I never hit the brake and must have let up on the trottle. I swung back and forch, 4-5 times, never enough to cross the center line. Can't tell you what the trailer was doing. Trying to figure it out---I think it swung to the end of the safety chain and than reversed direction. Everything felt like slow motion. My Spyder finally settled back to road and I contined on---scared out of my mind. Any thoughts that will settle my nerves.