Highway Jittering Fixed...

I have a 2010 Tacoma 2wd Dbl cab. The truck would get jittery on the highway when I would get behind 18 wheelers. I switched from the stock Dunlops to larger Yokohama Geolanders but it didn't solve the problem. Ran the Geolanders for 35K miles and figured it was something I would have to live with. Put on a set of Michelin LTX a couple of weeks ago and the Jittering seems to be gone. Only thing I can figure is stiffer sidewalls made the difference?

Anyone else notice this?

 

I thought this happened to any vehicle. I notice if it stay dead center behind and up close to the wheeler it won't sway, but if I peek out I get it, even in my cars with low profile stiff sidewall tires.

 

would always lower my presure 3-5 psi when I ran MT's on my jeep. helped the white knuckle ride on the interstate a lot