Had the same problem with my truck call motor carrier talk to the officer was told that the legal weight was base on max tire loading take all the max load add then together this will give you the weight you can carry he said i would be surprise by the number i have a sprinter with the max on the tiresof 3042 per tire. i would be able to carry 12,158. call back he said that was correct but going over 10,000 meant i whould have to run a log book.