I bought one of the ankle kits a while back (Dark Angel Medical) and think its awesome. I was already having belt and pocket space issues and putting medical equipment weight (modest) on the ankle vs. gun weight (more) is much betterer. The only issue I have is in duty uniform where my pants are tucked into my boots. For that, I have a small pocket on the calf of each leg. I keep a TQ in one and a pocket DARK mini in the other.
We also have an IFAK and CPR mask in each car. My teacher spouse has a similar kit in her classroom (CPR mask +IFAK with three of everything (TQs, chest seals, dressings, hemostatic ribbon guaze). Oh, I also have my military IFAK attached to my range bag when I dont need it on my gear for work.
We have taken a two day trauma course twice in the last three years. We need to do more informal practice.