Well, I can't say how cool this guys engine runs but he certainly went to great efforts to block the front of the radiator.
All joking aside I'm not so sure I would want to block the front of the radiator like you're thinking about. I doubt the weight of the bike (assuming motorcycle) would be to much additional tongue weight. At a minimum the hitch should be rated for 2000 lbs with a tongue load of around 500 to a 1000 lbs.
If you have your owners manual see if it specifies trailer/tongue loads.
Sorry, I'm not much help.