The only thing with running permits is you cannot run at night and have to hit all weigh scales.
I have run many times without permits and have been lucky.
I am not much help here but to say if you don't like driving at night, then run permits. It takes a while to get them too, doesn't it? You may not have enough time to get them. That has been my issue in the past, just not able to get them when I need to get haulin' down the road.
Basically, what I am saying is it's a 50/50 shot.