Pullrite Super Glide? or Reese manual?

Also how often do you need to slide it back and are you normally in a place where its a nightmare to do it?? ( Like in traffic }

IMO your imagination is running away here. :).
I also own a 16K Reese manual square tube slider. Bought it new in '97 and it has been on two different trucks with around 310k total miles. I keep it lubed and maintained so it slides like a hot knife through butter at any angle.
I've been in all type of traffic situations and have never had to flip the arm to maneuver position while in traffic.

Let me ask this. I have a crew cab and when making a tight turn can you tell how close it is getting to the cab? I mean most of the time when making a turn the 5er is pretty close to the cab like just a couple of inches right? Do you have to worry when making most turns. If that is the case then its a no brainer.

Cab size doesn't enter into how close the trailer comes to the cab. What determines how close the trailer comes to a trucks cab is the distance from the back of the cab to the trucks rear axle or the CA dimension (cab to axle).
GM has the longest dimension and the most clearance. Lots of GM truck owners with the newer rounded/notched front corner profile trailers don't use any type of sliding hitch. A few GM owners bit into the you gotta' have a Superglide hype but after using their combos for a while they sold the Superglide to someone who needed it.

I seldom use the slide feature on my manual slider even with my old '97 5th wheel trailer with a very flat square corner profile. My hitch is located zero over the trucks rear axle. This allows the trailer pin to slide its full 10" behind the trucks rear axle. This allows for less steering input and quicker reaction by the trailer while backing in tight spots.