I never had any issues moving my cars around my shop by myself on the dollies, complete cars included. On a sloped driveway I needed two people.
But this shouldn't be surprising, how easy do you think it's going to be to move a 3,500 lb car? They're just dollies, they don't defeat the laws of physics.
I’ve used the expensive one and you can move a car around with one hand. If you done mind pushing on your car as hard as you can then the HF ones will work fine.
