There has been much buzz about car hacking, but what about the larger heavy-duty brother, the big rig? Heavy trucks are increasingly networked, connected and susceptible to attack. Networks inside trucks frequently use Internet connected devices even on safety-critical networks where access to brakes and engine control is possible. Unfortunately, tools for doing analysis on heavy trucks are expensive and proprietary. Six_Volts and Haystack have put together a set of tools that include open hardware and software to make analyzing these beasts easier and more affordable.