Today I started learning how to use SketchUp (formerly Google SketchUp) to model my future box van build. I chose to use the web version at https://my.sketchup.com/app on my Chromebook. There is a bit of a learning curve, but great so far. SketchUp auto-saves periodically and you can sign in with a Goolgle account, or make a account with Trimble. I found the model for a 10" U-Haul box van online and imported it. I started modifying it and will share my progress along the way.
Slightly modified version from the model I downloaded:
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Slightly modified version from the model I downloaded: