You have to take into consideration that the first gen trucks have very little positive caster (+3 degrees) compared to the other brands at around +6 degrees. Anything loose or worn will give the front end a mind of it's own. The less positve caster there is the more the front wheels will want to follow any irregularities in the road. the more positive caster, the straighter a line the wheels want to follow. It's rather over simplified but hope you get the idea.
Led.
Led.