Dont buy if you expect the size to match what you already have
I bought a set of Terrain Pros because they looked like a good tread pattern and I thought that they would look good on my truck. Unfortunately, once they were mounted, I noticed that they did not look as wide, so not as good, on my truck as my Toyos had. Looks aren't everything but I sure would have been happier if they looked as good as I had expected.
Side by side comparison picture attached of Toyo Open Country RT to AMP Terrain Pro. Both in 285/60R20. Both are specified as having 11.5in width.
Only with creative measuring can the Terrain Pro be stretched to 11.5in. You don't need a tape measure to see the difference in width with your bare eye.
Back to Toyos for me.