I have a 2" receiver on my truck but was only able to get a 1.25" receiver for my wife's Kona. Tomorrow I should be taking delivery of our Motow rack that will work with both. The aftermarket Curtis for her car has a 200lb limit and also recommends an extra strap to help stabilize the load. Between two ebikes (100-110lb without the batteries) and the 28lb rack, should be ok. For the truck I also got the lift, will probably try it on her car too, but that adds another 23lbs!
I think Kyle over at Bolton Bikes has a carrier video and he may even have a Prius and hitch rack, look it up and check it out, he's usually pretty good with his advice.