Originally Posted by PaulRivers

Issues with that style of rack are the same as with aluminum/steel bikes - paint getting rubbed off at the contact point, bikes ending up rubbing against each other on the rack (again usually paint problems), and unusual frame designs making it difficult to get the bike onto the rack.

I would not get the rack you listed above personally. It's:
- $500
- 2" hitch
- With the swing out arm it's going to be pretty big and pretty heavy
- You're going to have all the drawbacks listed out above

If you were buying a cheaper rack I could see dealing with the issues, but for that kind of money you could get a 4 bike tray style rack like the Saris Freedom 4:
https://www.saris.com/product/freedom-4

Easier to get bikes on and off of it, actually holds 4 bikes (often the frame racks only really hold 3, not 4 in actual use), bikes don't touch each other so no paint issues, and unusual frame designs are no problem (all bikes have 2 wheels).

That's my opinion.