Best trailer hitch

[subieworx]

I have a 2003 Denali (non xl) that I use to tow my race car and other things around and while replacing the license plate lights last week I noticed that the rear bumper and hitch are very rusty. I am going to replace both and wanted to see what other thought about the best hitch to use. I would assume OEM, but am having difficulty finding the specific part number.