Roto/Chocks are the best, and I have a set in the side box. However I was at the Frieghtliner store and picked up a set of chocks for $9.00 each. They are just so much faster to install. Takes about 2 minutes to install and they are made of rubber and will last a life time. You can also get them at Tractor Supply. GBY....
2006 FreightLiner M2
Trailer Saver Air Ride (TSLB2H)
Pressure Pro System
2008 Chevy Silverado 1500 C/C (Grocery hauler)
2009 Chevy HHR LT 2
2010 Mobile Suites 38 RSSB 3/4