Not that I don't think a Prius can do it, but I'm surprised uHaul let you do this. Around here they seem to be pretty strict with vehicle type and trailer weight to cover their own tail.
According to Toyota, they do not "recommended" pulling anything with a Prius...in the US that is. That does not legally forbid it though. I have the Curt 1-1/4" receiver with the euro 2" offset hitch with the Curt harness. Worked both ways Dallas to Denver plus a few trips to Home Depot and the dump...and it's the same parts used for our 2015 Prius. Be advised though...you will not get 50 MPG pulling a load with this.