That's exactly what my 285 Goodyears did to me. They handle all conditions great, but even unloaded it got noticably "squishy" on the highway. Towing a heavy load is nerve racking to say the least.

How do these spacers affect the alignment? Seems like holding the frame higher is gonna move the trackbar a bit, so maybe thats why it handles different. Truck just needs an alignment?

 

I had allignment done and nothing had to be touched.

 

I have noticed no difference in the way the truck drives, but I haven't towed yet either.