My TT came with independent electric jacks at the 4 corners. Like mentioned previously, level side to side, then front to back, drop front just a tad and run the rear stabilizers down till snug, jack the front back up and drop the front stabilizers. It's pretty stable at that point, but I still use two scissor jacks mid frame to reduce bounce.
As far as reliability they're electric motors. Keep them lubed and in good shape. It's not like they are being used day in and out to burn them out.