The only way I know to do what you want, without cutting, welding and mucking everything up is to buy longer shocks. That said, there's only about 2 3/4 inches of travel stock in the rear. Raising the rear two inches will push the trail on the front into the danger zone, perhaps. Trail keeps the front wheel tracking straight with enough 'give' for going left and right on demand. Too much trail is hard to turn....to little is a very skittish feeling at the bars. Wobble is a distinct possibility. If you have a frame guy around that can tell you what you'd be doing to the geometry, I think you'd have time well spent.