Tongue weight is one thing. All of these hitches put the bike and therefore center of mass well passed the ball of the hitch. The farther you push the load back past the ball the greater the tongue weight becomes when you are driving.
Get on a seesaw. Put the fat kid close to the fulcrum and you can balance him by sitting on the end of the plank. Once you hit a dip in the road things oscillate for a while.
I use a single receiver tube type hitch. It carries the load, but they swing and twist going down the road. My 36’ motor home does not know it is back there. My Cadillac SRX lets me know something is not right.
If you are carrying anything over 300 pounds for long distances I would get one the uses two hitch mounts. Those single hitch mounts are good for scooters. I don’t care what the advertisement says.
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