90% at least of the instability in crosswinds is due to tires. Stiffer
sidewalls take out most of the "funky chicken" in crosswinds and the wake
from trucks. 15 or 16 inch tires are much stronger than 14's. You can spend
all you want on other suspension mods, but all of them combined won't do
what better/bigger tires/wheels will. THIS IS NOT A TIRE THREAD, HOWEVER.

   John