I have the Garin RV 760. It allows you to enter the dimensions of your RV including height, length, with etc. so far it has been very helpful. I have lifetime maps and just updated for our trip to the beac. Just about every road we take, and there are many from Big Bear to Bolsa Chica via Lucerne Valley, is being reconstructed, new exits, new byways new this and that. The 760 keeps up with all the changes very nicely.
In Canada it didn't want to route us on the ice road. It a modern wide 2 lane road. Been on it before and as far as I could tell it was because of the frost heaves and the repaving. Sure was choppy.
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