Years ago I used to take my KTM MX bike with a MotoJackRack on the back of my Explorer. For shorter trips it was more convenient than loading the box trailer. The bike rack + was getting close to 300 lb and the Explorer was rated at 6400 lb towing 640 tongues so I was
I also had air assisted kicks to level the Explorer. I could feel it back there and there was a tendency to oversteer in corners but it wasn’t too bad.
For heavier bikes, I had a friend tow his Ducati behind his Jaguar (custom built cottage) using something like this: Motorcycle Tow Caddy|MagnetaTrailers.com
I think a small rail trailer is a better idea.