We have the Rand McNally 7710rv that allows you to put in height, weight and length. It is very useful and I love the big screen. It also has a lot of other features, like elevation, sunrise, sunset,etc not usually found on GPS. I believe the new Rand 7725RV has a feature that you can put a wireless back up camera, it might be worthwhile to check out their website. We also have 2 garmin GPS's, but love the Rand for the RV
Fred
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