Steering trouble

Let me explain,first off the truck is an 04 Toyota Tacoma 4x4 2.7 L base model. It has done this ever since I bought it 2 years ago. When driving it on the road-any lean, fall,uneven pavement the truck wants to go that way. It's a constant correction. Does anyone know what could be causing this ?Any insight on this matter will be greatly appreciated.

 

jack the front wheel off the ground and check for looseness or wobble in the bearings and front end such as upper and lower ball joints and the tie rods and try lifting the wheel up and down because bad lower ball joints will most often move up and down before you see any side to side play.

looseness in the front end will cause it to follow the influences of the road

also get on a smooth flat road and see if the truck wants to go to the side, if so its out of alignment and this also get magnified by the influences of the road