Originally Posted by finalfrontier38
Thanks for all of the feedback! Taking it to the dealer to see if they can drill and tap the holes a size up... and to get a second opinion. I got it used 12 mo ago and it was Toyota Certified, so hoping it's all under warranty, since its their fault that the bolts were missing.
I think you are making the correct decision, and it should be relatively simple and inexpensive thing to do. I surprised the hitch installer just didn't do that automatically. As M1Tommy suggested, I would be looking for someone other than that guy to do the work.
As far as I know Toyota does not put any bolts in the empty holes. They just pre-tap the hole and leave it like that.