bike racks

I just took delivery on my 392. I've been looking for a spare tire bike rack that can hold my bike and my two kids' bikes. It seems from my research that the spare tire bike racks max out at two bikes. Anything more than that requires a hitch-mounted rack. I'm guessing this is due to weight...

I am looking for a two- to four-bike rack to be attached via receiver hitch. I would appreciate any suggestions. Thanks!