87 toyota pickup.. stock.. no power steering
front tires have a fast leek. its gets hard to turn. when i fill them and when i reach around 30-40- miles per hour, gets easier to turn(duh) but truck starts shaking. when i look at the drivers side tire, its wobbling. the truck stops wobbling if im driving on a road with a slight curve(when the steering wheel is tight).
what do you guys thinks it is-
-steering is jacked?
-somethings loose in the suspension?

its gets really sketchy sometimes... please help