I have an old, very beat-up pickup truck that has developed the "death wobble" on the highway, like when it's going over 50 and hits a rough spot. That will set off a violent shaking in the front end that won't stop untill the truck slows way down. This is a 1994 Dodge Ram 2500 4x4 with the diesel engine. Death wobble is fairly common in these Dodges, which have a very underbuilt front end. This truck spent its life getting salty in the winter; at this point it's just about disintegrating. It's no surprise death wobble finally hit.
Apparently, adjusting the caster can alleviate the problem (or so some say). This brings me to my question: positive or negative caster?
Grocery shopping carts have a lot of trail (in effect, positive caster), but are vulnerable to an effect similar to death wobble, where the caster goes into a violent oscillation. One could naively conclude that positive caster invites "death wobble." However, positive caster in motor vehicles enhances high-speed stability. I presume that giving my truck a positive caster is the right approach. Yea or Nay?