PINE APPLE, Ala. — Their little bodies shrouded in plastic bags, the five children of Timothy Ray Jones Jr. had been dead for days by the time he led investigators to the spot where they had been dumped among dead trees and scrub brush. The children’s journey to that isolated hilltop in central Alabama covered hundreds of miles and crisscrossed several Southeastern states as Jones drove his Cadillac Escalade around for days, using bleach to try to mask the smell of the decomposing bodies, authorities said Wednesday. Jones was arrested Saturday at a DUI checkpoint in Mississippi, about 500 miles from his hometown of Lexington, South Carolina.