if i didn't live in florida most of the year, i'd deffinately consider a narrower tire. we have to have them down here because of the sugar sand. some trails go on for miles with sand that you will sink to your knee in if you step out of the truck. the difference in skinny and wide tires here is very noticable with skinnys being at a dissadvantage. one of the few scenarios where this is the case though.
However, you do have to realize that in the grand scheme of things, a 285 (average for people on this site) is still fairly narrow.