Beadlock wheels are very useful off road, as they clamp the tire's bead to the wheel when you're running low air pressure. Though in the gray area of street legality (most companies recommend them only for off-road use), beadlock wheels are found on 100-mph desert trucks and abusive rock rigs all the time, making us think they're as safe as any wheel.
Installing beadlocks may seem tricky, but most can be easily mounted at home with basic handtools and a little elbow grease. Your back may hurt the next day, but most folks can mount four beadlocks in around two hours.