Since you have the chevy leaves, maybe look into a chevy add a leaf. We put one in a buddy's F150 that lifted it 2". Maybe with the lighter truck, a full size add a leaf will get you the 3" you desire.
TTORA forum is the best Toyota off-road club around. We are nation wide with chapters in most states. Come in and discuss Tacoma, 4Runner, Highlander, & TRD models.