Hitch-mounted motorcycle rack

First I want to thank all y’all for responding to my questions. After reading over the various responses, I’m thinking the best thing for me would be to simply remove my trailer hitch and bolt in some thick C channel brackets with the bolts that formerly held the trailer hitch in place. These are the existing bolts that hold the bumper brackets in place (I’d also replace the bolts with some new hardened steel bolts). That way I can mount a dedicated motorcycle rack that I’ll know will be strong enough and will also lift the cycle and rack high enough for adequate ground clearance when the Caravans towed with the tow dolly.
The following is a side cross/section diagram (cartoon) of what I have in mind.