I have a 2004 Chevy 2500 HD. Every now and again when I hit a bump my truck pulls bad to the right. On top of that while driving it sounds like the right brake is being applied because the tire sounds like it is skipping. Does anyone know what it could be? The front end has been completely done and has had an alignment too.

 

My guess is he caliper is locking.

 

is the right brake getting hot? smell burnt pad? 2 signs of a dragging brake

has the truck ever been in an accident? bump steer is a condition that causes a directional change when the front suspension jouces and rebounds. this isn't a pull but rather a momentary directional change. this occurs due to the steering linkage not being level.
the only reason the linkage or steering arms are not level is usually a collision.
this can be checked on an alignment rack. the tech watches toe change as the vehicle is jounced. the toe should move equally in opposite directions...if toe moves in the same direction you have a problem.