It doesn't matter if the Nissan was modded or not, since you don't even need mods to complete the trip. A high clearance 2WD would do as well. Also, the Land Rovers didn't officially complete the trip either since they had to bypass in Oregon due to the wildfires. So, technically the TAT is still uncompleted by an SUV, unless someone else has already done it, but not been documented. Or it has been documented but we just don't now about it. Actually, it's hard to believe that it hasn't been done before this. Maybe the Land Rover trip just had the advantage of better press? Who knows? Finally, the TAT's the TAT, and nothing else. There are undoubtedly other legitimate ways to do the same thing.
It does matter, if you trying to obtain a certain title. the LR's did complete it, because they went backwards on the missed parts to make sure it WAS completed. Bypassing a raging fire, then retracing the part they missed because of the fire, is different than a modified 4x4 that seems to have bypassed several states. I sincerely doubt a high clearance 2wd would get through Nevada. (and what production high clearance 2wd would you be referring to?)
Call the guy who made the map. Ask him whether he has heard of any SUV's making it. Better yet, ask the only gas stations near the trail- for hundreds of miles if an SUV has come passing by off the trail.
Ask your friend how he got around the downed trees- that were there before he even bought the maps. That were still there when the LR' guys went through.
No, there pretty much isn't anything else like the TAT, in the region that the TAT covers. The TAT is ever changing, ever so slightly, but there are sections that just did not change, and was not changed on the map.
Maybe someone else did do it; but Im pretty certain it wasn't the Xterra on the full TAT.
By his own admission, the Xterra didn't finish the TAT. the LR did. the Xterra has mechanical failure of a PS pump. the LR didn't. The Xterra had tires that look perfectly new at the end. the LR didn't. End of story. I can say I can eat 400 hotdogs in 5 minutes at home,show some random pictures it doesn't give me the title of the hotdog eating champion. 4 points isn't even close to the TAT! This is why we have clocking and recording agencies, such as Guinness book of world records.
LR isn't the first to try, and many motorcycles and even quads and atv's have finished the TAT, but LR are the first vehicle mfg that proves you could walk in to a dealer and leave driving the vehicle straight onto the TAT from beginning to end without mechanical failures.
Give credit where credit is due.