I totally prefer driving a locker on the street as well. Much more traction.
Before the locker i couldnt lift the clutch without laying down a single legger in the rain, let alone in the snow.
They need lots of respect on the corners, and the occasional locker pop can get exciting, but i think all trucks with the kind of weight distribution that the diesel pickups have should have lockers.
Careful with the lockrite, you will probably be fine with the axle size you have, and considering that it is a "normal" truck. In the past i have seen a lot of lock rites snap the side gears when under a lot of stress, but that is limited to Jeeps and land cruisers with high hose power V8s, big tires and stock little axles.