PHOENIX — Last year, Nissan made big news with the full-sized Titan pickup, which was completely redesigned and restyled for the first time since it went on sale back in the 2004 model year. Truck owners are fervently brand loyal, and Nissan has had a rough time of it, trying to get Ford F-150, Chevy Silverado and Ram 1500 owners to switch brands. As a result, Titan sales have never quite lived up to expectations.