For my S05 XXL I bolted four Rock Steady stands together; two 28" x 32" units, and two 32" x 44" units.
Honestly… I wouldn’t go that way again. In fact, I’d avoid it like the plague.
In the time I spent squaring the four units up and messing with the drawer slide mounts that I thought were cute (but fit amazingly poorly), I could have easily thrown together a stand with lapped and tenoned joints out of southern yellow pine and a torsion box top. With just hand tools.
I’m only mildly exaggerating here.
I’m still not happy with the stand, but it’s an ultra low priority until after the holidays since my machine is getting a pretty constant workout at the moment.