Thor Forums

[petef]

I am not sure adjusting castor 1 degree will affect side to side movement, in fact it really does not play into the picture. Caster deals with 2 things, the amount of time the steering wheel realigns to straight, and pulling to one side or the other. At best you want a little positive on the right side, the total numbers don't really mean much unless you don't have power steering. Think of the wheels being a little forward or a little behind your front wheel axis point. A little forward would be harder to steer. In degree terms 3-5 degree is nothing. The problem always was if the right side was negative, ie, behind the axis point of the left side, then a pull to the right was common, and with road crown it had to be fixed.
Your issue of blow by or wind is not a castor issue, some sort or rear trac bar and /or/ stiffen the front suspension will cure it. You have a box on top of a pick up truck chassis, they were made to sleep in not drive!