For Euopean readers, Thule's burliest EU-approved hitch rack is tough enough to carry a pair of heavy gravity mountain bikes, ebikes, fat bikes, or fat full suspension e-bikes.
The Kuat Transfer is an entry-level rack that can be converted from a single to a double bike hitch rack. The Pivot get mountain bikes them out of the way to get to the trunk or truck bed.
The Yakima Dr. Tray hitch-mounted bike has sliding trays which eliminate bike-on-bike contact while driving to the trailhead. While this is a premium rack with innovative features at a premium price, it still isn't quite perfect.