Australian locksmith Barrie Fox wanted the freedom to explore when he bought a caravan (recreational vehicle) in 2017. But he soon found there was a learning curve. If you want to legally caravan in Australia, you have to closely keep track of your weight. And not just the weight of the caravan itself but everything you load in for a trip: food, beverages, and clothing. Fortunately for Fox, he found Thunkable and was able to create a custom calculator app. Learn all the details in his story.