Against all advice, I use supports under our very long LR/dinette slide. This is not so much as a support but as a device to lessen the 5th wheel jiggle while we are at our summer seasonal CG. When we travel, those supports stay home. The other 3 slides are self standing with no supports. If you do use them, just understand that there are potential dangers involved. As far as a tire suddenly deflating on ours, I have the front landing gear, a set of BAL manual scissors jacks under the frame kick down (at approximately the entry door) and the rear jacks so very little chance of a sideways 'lurch'.
Just as a note and somewhat off the OPs subject - I don't use hollow core concrete blocks ever and something I'm starting to see more of lately with seasonal site campers.
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