Welcome Chopper Bob
I can remember on an road bike, pedals only, not motorized, it was the crummy saddle bags and the rat trap carrier it was attached to that did not have much to keep the bags from moving into the spokes. Going down a mountain along with a group of riders out for a month an a half doing 1K miles when I was 17, the rear tire was fish tailing back and forth. My butt came off the seat to get a lower center of gravity on this huge length of grade in New Hampshire. Crotch on the bar and maybe 20 feet skidded to a stop.
Tire still good and tube as well. I related this to a guy that I heard skidding may 75 feet, though that was a few years later after my similar experience and this guy on a manufactured street motorcycle had a bungee cord wind up on the rear tire axle. I think he boke out a doobe an some time to settle before pulling out the mashed wound up cord, an then rode off. The fender thing I had do to the rear wheel as well and pulled over to the curb and no injury then either. Just though if any had been front wheel lock up, don't want to think how those end up!
I am not sure when I will get the Briggs Off Road Bike back running. The valves grinding the tips some to adjust was like 2 years ago. The bugs had me thinking finish the job indoors. Now a bit closer to ocean by just 1/2 mile and less bugs. I may try when I get things situated better as the place I was at was bigger, but the landlord sold the place, so I had to move.
At least during last winter and again this fall/winter when rain can fill the river and dam at the Pacific I have my huge swimming pool. Halocline, look it up. I had scuba dived swimming through big puffy clouds. Sometimes it was instead like plate glass or dual plate glass intersection of salt water on the bottom, heavier, and fresh river water on top, lighter. King Tides causing saltwater intrusion. The cheapo GoPro Imitation the SJ Cam 4000 WiFi I had on a helmet a go a few seconds of cloud look as back eddy currents formed the cloud look.
The coves look like I can snorkel on the Pacific now, but the river water is too low. In fact there has been deposited about 15 feet of silt in an area that I was a few years ago seeing the tracks for rail cars from early 1900's for lumber at a mill by the river. I was at 30 feet and there were 5 foot diameter boulders, of which is all under silt now. The scuba diving is a sport that allows for weightlessness and my spine does have issues of nerve pain that not ready to have surgeons doing other than epidural currently. My cubital tunnel surgery is done and is just half the nerve path fixed so I am getting by.
Let me attach this photo I took of what someone cobbled together for a trailer hitch motorcycle carrier. No ramp needed. I would hope the jack is backed up with something to add to possible leaking hydraulic. Scissor jack work platform for a motorcycle seems was the only manufactured item and was modified.