^^^No it can't back double trailers but it can make it easier for a driver who is capable of backing doubles. Because my motorcycle trailer is short and a little narrow I really have to pay attention to the rear trailer when backing up .... if I use PTBA while backing around a corner, I can pay attention to the back trailer and count on the Ford system to prevent the cab of my short box truck from hitting on the front trailer. Or, when I'm backing the two trailers straight down the road, I'm not able to see the rear trailer at all, so, the PTBA is useful to keep the truck and front trailer perfectly straight while I glance back and forth from mirror to mirror watching and waiting for the rear trailer to pop into view. With the PTBA keeping the truck and front trailer straight I have enough time when the rear trailer appears to quickly respond before the short rear trailer jack knifes on me.