I recommend the Brophy # HSAB. This does not show in the fit guide for a 5-1/2' bed as that short of bed is not generally used for truck campers. So you have to go by how they install to finish verifying. The external bed rail width cannot be more than 5-1/2 inches wide. There will need to be at least 2 inches space under the lip of the bed rail. This install by clamping onto the bed rails of your truck, no drilling required.
You will want to use the Brophy Basic Turnbuckles w/ Hardware... view full answer...
The Access TonnoSport Soft, Roll-Up Tonneau Cover # A22030239 is water resistant. It is not water proof as water can find its way in through the rails or stake pockets. The tarp/cover will repel water and the Velcro system will keep it tight so you won't have standing water on your cover. view full answer...
The Air Lift Air Shock Controller Compressor System # AL25804 can be connected directly to the battery on your 2016 Nissan Titan XD. Do understand that this may cause a power draw on your battery when it is parked. If you go through the fuse panel and tie into a ignition on circuit this will ensure that you do not risk draining the battery on your Titan if it sits for an extended period of time. It will also protect against the system running if the switch becomes stuck in the fill position. view full answer...