Never been there, but I've been through lots of Interstate Highway tunnels in many states with a full propane tank. I wouldn't fret about it. I think, if you went through with a big Peterbilt, pulling a 30,000-gallon propane tanker, you might attract some attention. But you don't need a hazmat license to drive your motor home, and hazmat restrictions don't apply.
What I do worry about is the clearances in tunnels. All tunnels on Interstates are safe for motor homes, I guess, but some other tunnels aren't. For example, when the tunnel on I-10 in Mobile is closed, which happens sometimes if there's a wreck in it or something, traffic may get routed through another nearby tunnel with only 12' clearance, through which my motor home definitely would not pass. So watch out for detours.
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-- Carl
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