Last year towing on rte 93 north through Boston, we came up to a tunnel which was marked with 13'6" clearance. Recalling the data sheet on our Montana stated 12' and inches, I thought we were fine with at least half a foot clearance. The data sheet did not include the forward a/c! Turns out we cleared the tunnel with TWO inches to spare. Like others have stated, we need to know our height and watch the clearance signs.
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