What would you spokeheads recommend for securing a bike in the bed of a pickup truck. I haven't a topper nor a "rack" for the bed. I was thinking of buying a lock of sorts that I could loop through the brackets bolted to the bed. Would that be good?

You see, I want to ride on my lunch hour, but my office is in a neighborhood of meth heads that like to steal stuff and pawn it for meth.

Or something...