The concrete blocks I am using are setting "holes up" and the holes are filled with earth, so even in the unlikely event that the blocks crumble to dust, the tires are still supported by 8 inches of earth.
I understand what you are saying though. If used incorrectly, for example if a lot of weight was concentrated on one point, blocks could certainly fracture.
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Palangi
2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg
TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE
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