We tried the Trailer Valet XL Drill powered dolly. It works, and based on your property it may be great for you. After using it for a couple of months, we decided to go for the electric TX6000 from Trax Dolly and haven't looked back.
Our particular use case - We have a 212SD that we keep in one of our detached garage bays. The detached garage sits at a right angle from the attached garage bays and has limited space to pull in and out of. From the door of the bay, we only have ~42' of concrete to maneuver on to get the boat lined up for the 9' opening of the bay. For those paying attention, yes, that is a little less than 3 inches per side clearance. I have no doubt in my mind that I could get it successfully stored on the hitch with the tow vehicle... at least once ... given enough time. For ease of use and to promote boating as often as we can, the dolly works well for us.
The Trailer Valet worked as advertised, however for us there was an slight uphill climb to get into the garage bay that it struggled with. Maybe a different drill would have helped, but it was spinning the tires, so doubtful that would have changed it. Another issue that I had with it was a combination of the hunched over position that using the dolly put you in and the noise of the unit while in use. While it never felt unsafe, it also never gave me a lot of confidece while making sharp turns. We bought ours from Costco and it came bundled with the mounting bracket for the trailer, the drill adapter, and both the 2" and the 2 5/16 balls. Looking today, Costco is $5 more than the sale price on etrailer and still includes both balls and the drill adapter, FWIW.
The TX6000 in comparison, is much more money. For us, the ease of use was worth it. The TX6000 is battery powered and we optioned ours with an onbaord charger. There is a battery meter on the handlebar, and I have not had any issues with the batteries so far. It is much quieter to use and does not require you to hunch over while operating as compared to the Trailer Valet. The TX6000 is configured with two wide spaced drive wheels and a front caster wheel, so it feels much more stable when making tight turns on the incline to the garage. I do still get some wheelslip when pushing the trailer axles over the lip of the garage floor, but it is at least managable and I am still able to make forward progess.
Having said all of that, if you are simply moving your boat around a tight space on level ground without a lot of manuvering, the Trailer Valet may be just what you need.