The 285's will fit on a 7" rim,but they will bulge the sidewalls a bit.Gives you better rim bead protection,but you could wear the centre of the tire out a little quicker.They shouldn't rub with the 3" lift.
If your going to put the steel rims on,why not go with a dedicated snow tire,like the cooper discoverer M&S.There is no comparison to an all-season,and they are pretty cheap too.