Hey Guys, I am thinking about buying a 2011 4runner and have a couple questions...first off I think that the trail model looks the best, the whole part timr 4wd deal, I used to own Ford F-250's and Chevy pickups with the old systems and did use them engaged on icy or potentially icy roads without problems. Can the trail model drive in the same conditions with 4wd engaged and just dial down the wheel slippage to like the sand mode ? Secondly, can the sr5 or trail wheels and tires be swapped onto the limited ? Are they the same height so that all the electronics are unaffected by the swap, the height of the trail is listed a little higher (but the roof rack appears to be taller) but the sr5 is listed with the same height....Live in VT and work in ski resort area so need to get up and down mtns in all storms