The warp needs to be wound tightly onto the warp beam. Think of a spool of sewing thread.
I’m trying out warping with a trapeze. I think I’ll like it a lot I could get consistent weight as I wound the warp.
Here’s the trapeze from the front.
It looks like a white warp thread is caught in the raddle. Watch out for this problem. It is a loose thread getting into a tangle.
When I got the warp straightened out you can see it belonged in another raddle space. Because it was so loose, it began to migrate into another dent. That will prohibit the whole warp from moving until the tangle is undone.
The extensions allow you to wind the last bit of the warp, up until you get to the cross to set up for threading.