I would doubt that you would have much of a problem, especially if the load is so low as to have little effect on engine cooling and presumably no effect on lighting.
When we were towing travel trailers before buying our camping van, We carried a couple of mountain bikes on a front mounted hitch on a Safari mini van, then a Sierra 1/2 ton, then on a Sierra 3/4 ton truck for more than 20 years with never an issue of any sort -apart from dirt and bugs on the bikes.
I adjusted the bike rack height such that the bike seats and bars were just barely visible from the driving position - didn't obscure visibility in any way and I could ensure thatall was well with the bikes.
There was minimal impact on the headlights, not really a problem, and we rarely were on the road with the bikes after dark.
I suppose technically an overly diligent officer could have taken exception, but that never happened.
Good luck with your plans, I think it is worth a try - if any unforeseen problem should arise, you can just make other plans with little investment involved since you already have the hitch mount.
(Edit - license plate could be an issue? We use a bike rack and a cargo rack together on teh back of our Sprinter and that combination obscures the license plate. I set things up to secure the plate to the van with three strong magnets and in this way can quickly swap the plate to the back of the cargo rack when needed. I added an LED license plate light to the cargo rack powered from teh 7 pin trailer socket on the sprinter.)