Need to use a floor jack and jack up under, as close as you can get to it, the lower ball joint and get the tire off the ground, 3-4 inches. Grab the tire at 12 and 6 and at 3 and 9 and shake it good with someone looking for the culprit. Likely causes are ball joints, wheel hub/bearing or control arm bushings. Any noises?
Do not drive this truck till you fix. That is a dangerous lean!!!!
Welcome to the forum from Oregon.