Simple bicycle rack in bed?

I use a front fork mount because that way I know its secured to the truck. Guess what happens if you get in an accident and your loose bikes go flying? Fun. I also run a bungee through the back wheel and connect to the bed rings.

Also while a determined thief can get through the lock the lock on a fork mount is good enough that I can go into a store and see my truck and be able to intercept any punk who tries to steal my bike.
Without the fork mount its easy prey. Not to mention that with the fork mount the wheel is secured in the cab.