When moving slow and turning wheel, truck will stop moving and takes a bit to get it to drive

This has been common on all GM rear-wheel-drive vehicles since the early '70s. At issue is a non-adjustable alignment angle called "toe-out-on-turns". It refers to the diameter of circle each front wheel is trying to make. The two don't agree so one tire has to slide across the road to keep pace with the other one. With the larger cars of the '70s, it was very noticeable when you'd back up and turn that the front end seemed to be wobbling. That was from one tire sticking to the pavement and the stress caused the sidewalls to flex. Once the point was reached where it couldn't flex anymore, the tread skidded to catch up, then it started all over.

This toe-out-on-turns isn't really an issue, and there is no way to adjust it. It just has to do with the geometry of the front suspension and steering components. Mainly that is the steering arms that are cast as part of the spindles. Toe-out-on-turns is what makes the left wheel turn further than the right one when turning left so it makes a smaller diameter circle.
The engineers just got a little carried away. There was probably some other trade-off they were after.

But this is something that has just started today? would that make a difference? Also like I said if I am stopped and slowly moving forward and turn the wheel either way the truck stops. Even with the wheels straightened out, it takes a bit of gas to get it going again

This condition happens when the rear differential spider gears are locked up, Here is a video to show how to check them.

https://youtu.be/ytqXLSjHNm0

Please run down this guide and report back.

So right I had this issue and the spider gears where shot, had to get a used rear end to fix it.