I just got a set put on today. $215. 00 mounted and balanced. They are in 285/70/17, so a little bit bigger than the stock 265 tire. I have them inflated to 65psi (max is 80) and they ride incredibly well - significantly better than the OEM BF Goodrich tires that I had before.
They are not as aggressive looking as the Terra Grappler, but they look pretty good anyway, and the ride really is quiet. They have a tread that runs uninterupted all the way around the tire, so they should wear well and be very smooth and quiet.
I also got an additional 600 pounds per tire (from 3140 to 3750) over the stock tires. At a total of 1,200 pounds, that's significant with a big fifth wheel...