Just strapping your ladders down may not be enough — depending on the job site it might be advisable to secure them so they don’t walk away. With its adjustable slotted u-bar, Brink’s Ladder Lock may be what you need to secure one or two ladders to your vehicle.
A heavy-duty coating over the steel u-bar and the 3/4″ locking pin are weather resistant and protect your paint from scratches. A small bumper reduces vibrations and sway noise you may get when traveling at freeway speeds. You can use the included padlock to secure the ladders or any padlock with a 3/8″ diameter shackle.
Brinks Automotive manufactures the Ladder Lock (or at least lends their name to it), though they seem to be a bastard child of the Brinks Corporation since the corporation doesn’t see fit to actually give them a website. You might have to do a little searching to find the product, but you’ll likely pay around $30 when you do. For a little more, buy the ladder locks in pairs with identically keyed locks.