The quick answer is I've been on Hwy 46 towing my 2006 3500RL 12.5' tall Monty several times and in both directions, between HWY 99 and HWY 101 and don't recall having any height concerns for any overpassing roads or tracks even through Wasco (near Bakersfield). So the easy answer would be not to worry about it.
Hopefully someone can give you a more accurate numerical response. Do you know how tall your rig sits when towing? Adding a description of your rig, if you create a signature, might help. But like the previous posts states, actually, if you are under 13.5 ft you should be able to clear any major Interstate or highway in the U.S. and HWY 46 is a major thoroughfare.
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