Some have mentioned the lever type, custom made for your tandem axle trailer "Chatham Chocks" on some threads. They are again available on ebay by a different maker. Search "RV chocks" and you will see them listed. They're $54.95, with free shipping. I've used them for several years and they really "lock down" the trailer and keep it from "jiggling." They're called "Easy Chock Wheel Locks" now.
2005 Rockwood 8280ss
2003 GMC 1500 Extended Cab "Dwight" (sold)
2005 Dodge Ram 2500HD QC4x4 Cummins "Brutus"
Drawtite Brake Controller
16K Pullrite Superglide