what do i look for i get a shake on the left side when i drive over 50 mile on 1990 Toyota Land Cruiser

1989 Toyota land cruiser

Asked by for the 1990 Toyota Land Cruiser
First check tire condition. Is the threads even, is it worn? Also have your wheels balanced. Second check your steering and suspension components for looseness or worn bearings.
thank u i will check, all areas that u listed