Are you the first owner of this TT? It sure looks like someone drilled holes for bumper support brackets. My Jayco did not have such holes.
If you properly install bumper support brackets and a high-quality receiver adapter, you should be able to carry a bike on many TT's.
I added four
bumper support brackets, two on each side. I then added a
receiver adapter. Just be very aware that the mounting bolts that come with such adapters are no good and need to be replaced with
Grade 8 bolts which you can get at Home Depot or Lowes. Never use the bolts that come with it, they will likely fail.
Also be aware that adding anything to your bumper will probably void your warranty for the bumper. You need to do this at your own risk.
Another excellent option, as someone else suggested, is having a reputable welder tackle the job.