I’ll add another vote for the 1-Up rack. As mentioned above, there’s zero plastic on the unit. It’ll be here, working as designed, long after I’m gone. They’re pricey, but we’ve been thrilled with it. I leave it on my vehicle which is parked outdoors, and it shows zero wear. We have 2 school age kids, and it’s modularity (it’s currently setup for 4 bikes) was another selling point. When the kids leave for college it’ll be easy to drop down to three and then two trays, and also easy to throw a tray back on if they’re home for the summer, etc.
It’s sturdy enough to hold a couple of e-bikes (but not 4). Truly a buy-it-for-life product.