Looking for the best trucker's GPS, Bluetooth and reverse camera assist unit devices

I'm new on the trucking business, but also think that is very good to take advantage of the Technology to help you at work. Until now I have been using my old Maguellan Maestro 4350, is a good device but is more focused to regular car use. Most of the time points me on the right direction, the worst issue is that you can not update the map from 2008, and does not show you trucks route and others related. I heard of a new GPS device "Garmin DEZL 560 LMT", but after reading Dieselboss GPS comparison chart, I lean more toward getting the PC Miller 750 that can show the "no truck allowed routes and low bridges". Any other GPS device that can show this?, How about Garmin?.

Blue tooth. I'm using my old motorola ear device. But external noises interfere very much. I readed good opinions in this forum about the Blue Parrott Xpressway & B250-XT models, also Plantronics Voyager PRO unit. Which are your experiences with them or other simillar units?

Also think that a rear camera that you can attach in the back of the trailer, can be very handy for reverse maneuvers, especially one that can see in the dark. Apparently the Garmin DEZL 560 has a conection for this. Have any of you Guys, have any experience with this type of devices?