Eddie I really like the sliding box idea too. I imagine they would slide equally well on a painted concrete floor also. A side benefit is that you also get some protection in the event of a basement flood due to a plumbing leak or a leaky hot water heater. This is a big worry of mine because the house is plumbed with poly b pipe. Yikes! 😱 If it's overland water flood though, all bets are off!
Rod