hello. new to the forum here from california. don't have a frontier YET but looking in getting one soon. leaning towards the the pro-4x. I'm not gonna be doing any crazy off roading but just the local sand dunes here in my area. prolly be getting the pro-4x but what are the differences between the SL and SV models and off course the pro-4x model. only major differences i notices between them is the rear locking diff. as long as it 4x4 I'm fine with that but some good knowledge would be great. i feel like i should be post this in general forum but thanks in advance