Ive been told and i believe that extra 10 is a better suspension for deep snow and hard aggresive riding. Now the thing that hasnt been explained to me is when it sucks when it comes to deep snow and why its a trenching machine. I am just curious. I like to know the how and why. That way i can make my own informed decission. As i have stated over and over, the RXL will recieve the xtra12 with a 136 track with a 1.25 lug track. The Storm will recieve the xtra10 with a 136 track with a 1.25. The RXL will be some ditches and trails, while the Storm will be the hammer down and abuse the living hell outta her sled. Like i stated earlier, i would like a explanaiton that i can understand.