I don't have any first hand knowledge of the terra grapplers but I just removed a set of trail grapplers because they were like giant boulders on my Jeep. I had a hard time trying to track down the weight of Nitto's tires when I was looking to get a new set. I don't know if that's something they kinda keep on the down low but I called them directly after I bought them to find out. I should have called before.
The trail grapplers were heavier than any other MT tire in the size I used to have. They weighed more than most 33" tires and I bought the 32". Each tire was like 60 pounds! If you can.... check out what the weight and rolling resistance is and revs per mile of the ones your interested in. I found out the hard way.