They come stock with a 121 but for around $800 you can buy an extension kit with track from Track USA. Mine is stretched to a 136 and it is a good improvement for handling but I have not really tested it in powder.
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Depends, a EDGE chassis can be a RMK or SKS which got longer then 136" My XCSP edge is a 121" at the moment and plan to convert to 136" EVEN then I wouldn't call it "great in deep pow" !?!? 144" & 155"+ are what you want for deep pow mountain riding. Where in NE you at??? Round here I'd be content w/ 136" Most I know who ride here all have 121"
Yeah you could consider it a trail sled but it all depends on how much powder you are talking about. I have only gone off trail a few times with mine and it can handle some powder. But you might have to notch the track to fit a 1.5 inch track.