Hitch Mount Bike Racks

I'm acquiring a bike to take along on trips It has a step-through frame. I'm looking for advice and experience with platform-style bike carriers which mount on the 2-inch trailer hitch of my Class C. Many of the racks I see on line are designed to be used either with a 1 1/2 inch or a 2 inch receiver, but I've read comments that the adapters which accomplish this versatility aren't all that rugged. Because this is an e-bike, it's heavier than standard road or trail bikes: something on the order of 40 pounds.

I'm looking for something that will hold securely at speed on the Interstate as well as on bumpy roads into cool boondock locations.

Thanks!

Rich