You might want to call Dennis Olthoff (704-647-9924) to ask for his suggestions with the big tires and heavy engine up front.
I do not think any alignment will reduce the amount of force necessary to turn the steering wheel. You could:
1) Get a larger dia steering wheel
2) Increase front tire pressure
3) Power steering
http://www.secondstrike.com/SecondSt...erSteering.htm
I am definitely considering the power steering this winter and I have smaller tires and a lighter engine!