I've got a Mercedes G-Wagon body that I'd like to use in building a crawler. Problem is that it's 1/18 scale. The wheelbase dimension I'm shooting for is about a 7" wheelbase (I assume wheelbase dimension is from axle-to-axle). When I see the width dimension listed in the specs for a vehicle, does that mean to the outside of the wheels (example: the Losi 1/18 Mini-Rock Crawler is listed as 7" inches wide)?