We use one every time we go out.
Our trailer is 42’ and it’s a front living room so lots of movement over the kingpin.
Then add in our two kids and 2 65lb dogs and well we are moving and bouncing.
We tried to do it without that but kid moves upfront you feel it in the back.
So we put the stand out and wow it made a world of difference.
We have the 6 point hydraulic leveling system with X chocks in the wheels but movement was there.
We also when stopped for a while will put two jack stands under the rear frame and it helps even more.
So for us it is a great addition and well worth the money and space it takes up.