In the process of planning a rack myself.
Looking at creating a floating rack using cork and rubber isolation pads. Entire rack would rest on a set of pads so no direct contact between the floor and rack.
Similar to these, but found some that rated higher that will carry the 400# of rack and gear.
" https://www.supplyhouse.com/Bluefin-VPRC-200-Rubber-Cork-Anti-Vibration-Pad-2-x-2-x-7-8?gclid=EAIaIQobChMIx_PNyLWy6gIVghx9Ch3TbQzbEAQYAyABEgJrMfD_BwE"
Looking at creating a floating rack using cork and rubber isolation pads. Entire rack would rest on a set of pads so no direct contact between the floor and rack.
Similar to these, but found some that rated higher that will carry the 400# of rack and gear.
" https://www.supplyhouse.com/Bluefin-VPRC-200-Rubber-Cork-Anti-Vibration-Pad-2-x-2-x-7-8?gclid=EAIaIQobChMIx_PNyLWy6gIVghx9Ch3TbQzbEAQYAyABEgJrMfD_BwE"