The dry lube plate does work great for 5er's but you still need to grease the king pin and locking jaws. Steel on Steel will lead to friction and wear of the metal components. At least when I was an engineer it would.
As stated above use a dry silicone spray for the sidle room tracks this will prevent dirt from being trapped in the lubricant and wearing out the gears on the retraction device.
If you have a TT just use a light amount of wheel bearing grease on the ball joint and clean this between trips. I carry a 1lb plastic tub in my front bay with paper wipes for the king pin joint to grease with every trip.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67