There may be more restrictions than many people realize. In Illinois vehicles wider than 96 inches are only allowed on federal, state, and a few other designated highways except to make local deliveries. Whether getting you to your destination is considered a local delivery or not is questionable but the law seems to be largely unenforced. I think that the OP is looking at units that are 96 inches wide and under so she is probably ok. If these laws are common outside IL then a lot of us driving traditional sized Cs and As are breaking the law more often than we think. I think the Coachmen brochure even warns you about this. But no one seems to care all that much....
About the Going To the Sun road, most people don't seem to realize that you CAN run an RV in on the EAST side of the mountain. Mind you, that's the long way around, and nowhere near as scenic as the GTS road.
Please don't even try the GTS road in anything big. The wear and tear to the road, not to mention the nerve wracking near-misses caused by your width and length are not worth it.
On the other hand, that is one fantastic drive. I've been over it in my old Power Wagon, and in my Diesel Dodge... Both were definitely a bit of a pain, due to length, and the tight corners.
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You guys make it sound like its a common problem, and could scare someone off. Its not as bad as it sounds on this thread, and Ive done a lot of traveling. Yes there are some places, but most are well marked, and I wouldn't consider it a big problem, just know your height and pay attention. In CGs you will run in to a lot more length problems, than height limits.
2001 27' Four Winds Class-C E-450 V-10.
Buick Park Ave Ultra, Ford Ranger PU, JD 500 backhoe.
1941 Farm All "A"
Lists like these usually cover clearance exceptions on roads and highways designated for truck traffic. Do not expect them to list the low clearances in places where trucks are not supposed to go. There may be some listings, but not all possible problem spots are in there.
For a class C, the number of problem places are really quite rare, and usually well marked in advance. But you simply will not find an all-inclusive listing for the purposes of trip planning. Remember, you are in the same size and weight class as a small school bus, a bread truck, or UPS delivery van.
But to get back the original question, when the sign says "No Trucks" it is best to pay attention. A town, or the highway department, put that sign up for a reason. It may be simply that they want to avoid the annoyance of large vehicles passing through that part of town, or it may be that they really don't fit.
One quick hint - If you are going to drive thru Canada, convert your feet & inches to Meters & Cms, both width and height, and your pounds to KGs. Also, your US Dollars to Canadian Dollars and Gallons to Liters. unless you just don't want to know how much you're paying for gas.