There are several types of 4 wheel and all wheel drives on the market today. In Jeeps there is select trac and command trac, one has the one front and one rear which you can use on dry payment and then there is the true 4 wheel drive, only to be used on wet roads since all wheels are in traction. Proper research will give you what you need. That said, a 2 wheel vehicle with locking rear end is very capable, particularly with chains for going and stopping.
never in doubt, often wrong