Gross Weights?

I'm currently in the process of updated my cab card from 80k to 93.2k, which is the most I can go according to manufacturers ratings (13.2 steer, 40k drives, and 20k/20k in the split configuration)...
My confusion is i have read on several different threads, where people stated that a certain state asked them to increase their gross by few thousand in order to obtain a permit for a certain load.
This makes it seem like you can go above the manufacturers limits as i cant imagine many people would set their cab cards for say 100k in MT if their truck was capable of 105k.
am i missing something or reading too much into it.

 

OK, so that where my confusion is coming in. GA for example doesnt allow for anything over 80k on the cab card. so in GA the Interstate system says tandem are restricted to 34k. State roads are allowable up to 40,680lbs.
so i would be allowable up to 93,200(12,300 +40 + 40) on state roads and 87,200 (13,2 +34+40)on the interstates?

 

i am currently at 80k, and 80k is all you can run on the cab card in GA.
however im trying to understand the process so i can raise the levels in states that do allow higher numbers.
right now im limited on general freight, because my combination is heavy. i can only scale around 43k in general freight. so im trying to set up to where i can run heavier loads and OS/OW.

if my factory rating on the axles is 13,200 40k, and 40k, then states that have a bridge formula that allows 40k on a tandem i should be able to run 93,200 max on a permit.
i should also be able to run 87,200 in states like NE, SD, and others that have no permit up to their max as long as i abide by their bridge formula(34k for tandem).

 

thats what i was thinking. just upping the weights where i can.
GA doesnt allow the cab card to go above 80k, but i can get an annual permit that will allow 14.5 high, 12 wide, and 100k total.
this makes better sense, as i was just told that raising cab card gross may increase insurance premiums.
this is all helping to better understand where i should and where i shouldnt changing it