Many years ago we bought a plastic heavy-duty notebook and plastic sleeves to serve as our permit book.
In the front of the book are pockets that contain smaller forms that are most often asked for by scale personnel such as insurance, single state registration and IFTA. In the sleeves that follow we have permits that pertain to certain states and then a copy of our lease.
In the inside cover we have an article with the laws pertaining to a weight exemption for generators and a copy of the ATdynamics Trailer exemption. We also keep a brochure DOT CHART 13 that is used for placarding and verifying that we have the right placards on the truck.
The pockets in the front of the book are all labeled with their contents and with the different names different states call the form. We did this when I would get nervous and not know what the officer was asking for. When I go into a scale I open the book to and when the officer asks me for forms I can easily find what they are asking for. If I do not immediately see it often the officer will point to the form they need.
Our permit book has stood the test of time and has moved with us from one truck to the next. This was money well spent and our permit book has saved us from a lot of hassle.