We've towed our '13 Wrangler Unlimited with 37s and 3" lift often with no issues. I'm not sold on the idea that towing with a lift and larger tires will necessarily kill ball joints, or unit bearings will fail more quickly.
Lot's of JK owners have complained about the ball joints that don't tow them, and I wonder if it could also be their driving style. Many folks I see in parking lots crank the wheels while parked to get into or out of parking spaces. If the wheels were rolling even a tiny bit while those wheels are being cranked, the friction on the tires and stress on the ball joints and bearings would be greatly reduced.
Just a thought... I've got almost 60K on stock bearings, joints, and steering linkage.