I've been using this for the last 5 years:
https://parkit360.ca/collections/par...-capacity-base
...and I can tell you first hand, with a 750 hitch weight, the fwd/backward rock of the units without stability are a REAL PITA to use when using a hitch ball. They do work, but it's a fair amount of exercise. This type of attachment would lessen the fwd/backward rocking motion that I do not see as an option for the trailer valet:
https://parkit360.ca/collections/acc...-trailer-dolly
I do like the parkit 360, but clearly one of it's major shortcomings is ease of use due to no horizontal support and though the trailer valet is far less expensive, I would think it could be equally interesting to use without that horizontal stabilization when using a hitch ball as the connection, esp when moving on uneven surfaces.
In lieu of having that horizontal support, I have simply been using my power jack foot with it as retracted as far as possible and I get zero horizontal movement....of course I had to engineer a way to get the trailer off the power jack, but once that was done, I had a very viable solution. I know I can get a bracket that would attach to the "a" frame, but I find moving the trailer from the front pivot point works better for me in tight areas.
Your results can and will vary.