I'd love to have a littmann to throw in a bag but could spend $200 other places. I agree with Loco though I didn't watch the vid yet, I'm at work.
It's nice to have the stuff but don't think because you have it you can do it.
I have epipens in my bags but that's because my wife and child are prescribed them.
A good litman can be had for around 50 bucsk. It's when you go digital/peds/cardio that they get pricey.
I had a 200 buck one until my dog used it for a chew toy. Now I use whatever I have available and provided. Typical diminished breath sounds, rhonchi, rhales, and apical can be heard with an ear to the chest. Don't need anything too fancy for trauma (or vent patients for that matter )