World Oilfield Forum
The company I work for sent us to an excellent school put on by Steven Hart of MidAmerica Transportation Services out of Montgomery, Texas. This class was strictly HazMat. The book we used in class, and still use, is "Handling Hazardous Materials," from J.J. Keller, jjkeller.com. Steven was involved with the feds and wrote a lot of the regs. I'm sure he can help, but no tellin' what he charges.
Road and bridge laws, axle weights, permits, etc., vary greatly state by state; I know there is a big difference between Texas and North Dakota. I've about decided even a lawyer can't keep everything legal.
The Federal Government has publications for the Federal Motor Carrier Safety Regulations. Most of that stuff can be found on google.