I also have a VPI turntable rack. I have a large 3" thick maple cutting board as a top and the legs are filled with sand. I have spikes between the cutting board and stand. My Clearaudio Innovation Wood sits on top.
I am in the midst of a cross country move and temporarily moved my turntable to the top of my Zoethecus rack. It was a nightmare. You had to tip toe if you went anywhere near the rack. The VPI is rock solid and vibration is not a concern. The only way I would use a maple rack for my turntable again is with a lab type vibration table on top. That said, I really like a maple rack for my tube gear. I had a SolidSteel rack for a while and the Zoethecus was a huge upgrade.
If it were me, I would look for a second VPI stand for the second table.