So back to the conversion question....so all depends on how serious of boondocking sled you want. I converted a MXZX 800ETEC to 137" with a 2" paddle. Also, risers,mountain skis, detached sway bar. Oh and definitely gears...this is a given in my opinion. Anyways, it is not nearly as capable in the deep stuff as my buddys' mountain sleds. The wider stance, front end height, and tunnel design limit its capabilities. Now realize this snow year was an aberration. Some of us may be swinging too far about our boondocking needs (yeah I'm talking about you Indy with your 155"

). So if you want to have a serious boondocking sled, I agree with Ezra and others - get a sled made for that riding.
I'm getting a new sled for boondocking - a 2015 Freeride 137 with 2.25" paddle. Would a 146" be more capable in deep snow? Certainly but I ride in northern Wisconsin and am not counting on this type of snow year repeating too often. I'm taking my old MXZX and converting it back to trail duty.