For me, both the 2S and 4S have a place in the mountains. I've owned both and can speak to the benefits of each.
My Nytro got down to 565lbs ready to ride....barely more than my 2105 Summit and yes....that's full of everything....including fuel.
AC M suspension, 153 x 2.25 Powerclaw track, a hybrid Doo front suspension and enough power mods to get it close to 150HP.....and the sled ripped.
What did you do to the front suspension on your nytro? Hybrid doo, did you use some doo parts? how did you get it so light? I'm just wondering because I may pick up a Nytro turbo really cheap, I know they're not the best handling machine, but for the deal I can get, might just for a fun turbo sled