Thanks Bruce. I already watched that one, and a couple more. I think I know what I did wrong. I did not hook up the lights, and brakes. Hey, I was setting it up in the yard, with no load on it, so didn't bother with the lights, and brakes. Apparently that makes a world of difference. LOL!
When I took it on the road, with everything hooked up, it discovered I was towing a trailer. I didn't bother setting it all up, because I had places to go, things to do, didn't have the time to fool with it, and didn't really need it. Since it's something we paid a good chunk of money for, I'll get it set up soon. Especially now that I know I have to plug in the lights, and brakes for it to get everything calibrated.
I took the mower to the repair place, went to eat breakfast, stopped by Lowes to pick something up for Dh, and came home.
The feature I love for hooking up the trailer, is the camera for the ball hitch. It zooms in on the ball hitch perfectly, so you can get it exactly under the receiver, and just lower the trailer onto the ball hitch. Such precision makes it easy peasy.