I was thinking about all the fence posts I removed with the jack and choker chain. I think the winch accessory choker chain would be a good thing to use on the rig. The metal jack on metal bumpers and sliders makes things precarious. You could wrap the chain around something under the rig and jack from the chain to prevent things from sliding around.
FYI - I do carry a 4x4 wood block to use with the stock bottle jack and I carry a full size jack stand on my moab runs to help with trail repairs.
Scott Yoder KD0DHP
2000 4Runner, 2.5" lift on 33's, locked, geared & armored.