2nd Gen Non-Engine/Transmission A little different steering question.

[Sageair]

My truck (see sig) steers great when I have a heavy goosneck trailer on but wanders badly when empty. What changes should be made to make it steer well all the time? Thanks , Steve

 

[mgoncalves]

If your trailer is heavy enough to make the rear sag a little, then it is altering your front axle caster. I would take it in and set the caster as far back as allowable.