shake at 60 miles per hour in 99 Quest

Hey guys I have a 99 Nissan Quest and it has a shake at 60 miles per hour. I already changed the struts, shocks, alignment, 4 tires, another alignment, front brakes and rotors, rear shoes and drums, and axles. I also checked the bearings and ball joints and there fine. Any suggestions of what else i can do?:runaround:

How many miles??

What condition are the motor mounts in??? Inner and outer tie rod ends. Steering rack?