Work with what you have now except...!!!Put pair of 125lb hypercoils on it!!! Like has been mentioned, adjust springs so you have about 1.5" of compressed travel 3.5" or more extension. If you do move the front of the ladder bar then you'll obviously have to correct the pinion angle...is it 'correct' now? A biased tire is probably the most forgiving, and put the biggest one you can fit currently.