05' Siverado 4X4 quad. Wheels sound loose, suspension?

65K odometer. When driving the front suspension sounds loose, duh duh duh, eradic sound. Truck steers fine, brakes fine. I noticed the tire wear is scalloped a little on the inside edges. I know I need to rotate the tires and most likely need a front end alignment but what is making that sound? Ball joints, control arm? Tires have from 32K till now with no attention, ive been lax. Hel'lava truck though! Thanks to whom ever answers.