I am a first time JK owner, and i'm curious about something. I am driving to Lansing from Grand Rapids this evening and its suppose to be nasty out. I always feel safer driving in 4wheel hi, but i read post where they say driving on pavement in 4wheel is bad for the vehicle. I'm wondering how fast and for how long can i keep it in 4wheel. Or if i really need to have it in 4wheel. I have a 2010 Sport Unlimited with 33x12.5/15 duratracts.