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this is just a question i kept thinking of as i was reading this post...

if you are leagal in the state you are registered in, what difference are the laws of a state your passing through?

Michigan you are not required to have a front license plate, BUT you are in Ohio, so that doesnt mean everytime someone runs down to toledo they have to put on a front license plate to be legal with ohio laws.
i know that example seems pretty out there and has nothing to do with CDL and lengths and all that are being discussed here, but its an example of what i'm trying to ask.

I think thats a great point, if you are legal in your home state you should be able to go anywhere imo. no way to know the rules for every state you don't live there so it shouldn't matter.