Dangerous and violent chassis flex problem!!!

[triggerthetruck]

...and to continue my little saga...I have today also ordered some new tires for the front. My old Bridgestones had done well but were wearing out at the edges and getting thin in the middles...and anything new will help...fortunately the tire man knew a thing or two about death wobble and such, checked my vehicle and spotted a few things...so I will be busy. The question now is...having larger, fatter tires may alter the tracking adjustment I require....How do I find out what that different adjustment will be? The tires are I think 31"...and about 10" width... Please..!! I dont cope with long explanations of technical detail... Best wishes....