My Tow Ready receiver, made by Cequent, for my H3 is made in USA. And it was purchased last Fall. I'll have to look at my receiver made for my Silverado; I believe it is also a Tow Ready. And if you go to Tow Ready site, the part number and the photo is identical to the Reese, Draw Tite, part number and photos.
Since they are all owned by Cequent, I'm betting they are all made and the only difference is the sticker applied after manufacturing.
Of course this goes with my Mexican made Silverado; which I have to say has better quality than my H3 that was made in Louisiana. Although I have to say, even though the fit/finish and interior on the H3 was terrible from the start, the H3 has been put through hell and so far the major components such as the axles, engine, trans, have all held up very well and those components were at least assembled in the USA. And the H3 has been beaten on some of the worse off-road trails in Moab, UT and Ouray, CO.
Have to be careful when people say the item is made by an American company or assembled in an American plant. Most of your vehicles contain a lot of non-American made parts.