4-bike 'hanging' racks are much lighter than 4-bike platform racks, around half the weight (40-50 lbs vs. 90-110 lbs). Also think about the weight distribution as hanging racks keep the bikes closer to the car, while platform racks (especially 4 bike racks) extend much further out from the hitch and you can really feel it when going over bumps.
Add on some MTB's that can weigh on average 25-30 lbs, and that'll give you a quick idea of what type of weight you'll be carrying. If you have lighter bikes, then that's even better.
I've calculated my 1UP Super Duty double with 2 add-on's, hitch locks, add-on locks, wheel locks, and EZ pull handle, weighs approx 101 lbs. Most of our bikes weigh between 25-30 lbs, so I have no problem putting all of that onto our 4Runner and hauling it around - approx 212 lbs of total tongue weight.
But then my 4Runner hitch mounts deeper underneath the frame, so it's a lot stronger than the Tesla hitch that just bolts to the very rear of the car's body. I don't think I'll be putting all 4 of our bikes onto the Model Y and driving around with it, but I'll still test it out when my car arrives and see how it feels (just around the neighborhood.... or until the trunk wall rips right off the car from the weight

).