My opinion is that the 4 corner jacks are a good basic start, but add an additional pair in the frame span near to the axles so that you remove the vertical frame flex and you'll find a lot of additional stability.
The X-brace does help reduce fore/aft rocking some, but the span of the frame and the fact that it is free to flex and bounce on the springs is a large part of the feeling of movement. Camco makes stands that look similar to automotive jack stands but they have a threaded screw jack instead of the auto repair style that has the rack and latch adjuster.
Adding a pair, or better yet add 2 pair so that you have 2 in front and 2 behind your rigs axles and you will reduce a great deal of the perceived motion.
https://www.amazon.com/Camco-Olympia.../dp/B000760FWU
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