Sorry, don't know of a solution for you.
I wish Google would add options to their map for weight, height, and width restrictions
I suppose this interstate only would also be a good option... but i kinda feel like the height and weight thing would be even more useful... 2-lane roads that can handle the height/weight will most likely be ok if it's found that they will offer a faster routing than an interstate option...
I'm hoping their robot will find enough of these posts online to justify the change..."are you listening GOOGLE?"
I will say, they are improving it all the time... I noticed the other day that they have added the speed limit of the current stretch of road....something I've wanted for a while...
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