Wheel chock expiration date!
I've got a pair of those yellow plastic wheel chocks that were a parting gift from the previous owner of my TT. This morning I was moving them around and just happened to take a closer look at them to find the following molded into the side of the block, "Do not use after 06/2011."
Go figure. The plastic probably decomposes when exposed to UV light for extended periods of time (continuous outdoor use).
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.