I just replaced the tires on my KarKaddy tow dolly.
I put car tires on it that have more than enough weight rating to handle the weight on the dolly and the weight that our Prius puts on the dolly.
Need to weigh it to be sure.
I purchased the KarKaddy used and the old tires were pretty old, they still had lots of tread, and the side walls were cracking.
I loaded the Prius and weighed the dolly, then I went and got new tires.
I would not put trailer tires on anything I tow from what I see happening with the trailer tires sold.
These tires should last a while.