Purchased two of these (one for the front, one for the rear). I like the concept. I love that they will not expire. In the event of a small fire, these will suppress and extinguish them, leaving no residue to clean up. However, visitors to our trailer ask what they are and when I tell them, they ask how to use them. They have not seen the videos of these in operation, and are therefore wary of pursuing or using them because they are not at all familiar with them. Many of us are very accusto...