Surge protectors are usually rated in joules, which are a way to measure energy, and in essence, the more joules the better. For computer systems, 1,000 joules or more is recommended. This joule rating gives you a sense of how long the device can protect against surges and spikes.
Most commercial motor vehicles in Wisconsin require a USDOT Number and it must be provided at the time of registration. If you are required to have a USDOT Number, and cannot produce the number for verification, your vehicle registration application will not be processed until a valid number is provided.
Finally, if you just want to operate within a single state, many states require that you get an intrastate only U.S. DOT number. Since the launch of the new Unified Registration System by the Federal Motor Carrier Safety Administration, something that used to take 10 minutes (getting a U.S. DOT number) now takes an average of 90 minutes. American Alliance Authority & Compliance can get you your intrastate U.S. DOT number for $69.