I had always thought that extended cabs with the rear "suicide" doors looked like they weren't going to be very structurally sound. That "steel is safer" concept is stupid - it has to do with how the vehicle is designed and how it distributes the loads. Pickups have never been that safe in the IIHS crash tests from what I've seen.
Now, those were all 1/2-ton "full sized" trucks. The Ram did badly, but the Ram 1500s have a lot of differences from the 2500/3500s. So I wanted to see what I could find on that. Found a test on a 2014 2500 (looks to be 4x4). Got a few different crashes, although not that offset crash. Frontal crash: 4 stars. Side crash: 5 stars. Side pole crash: 5 stars. Rollover: 4 stars. So overall, a lot safer than the 1500. I'm noticing the cab of the truck seems to hold up quite well regardless of how it's hit, and of course it has all the airbags you'd expect from a modern vehicle. The side impact looks like the driver gets a nice cushion of airbag pillows and doesn't look like it gets moved around a whole ton relatively. Obviously it would hurt to actually happen, but interesting data. The rear passenger didn't seem to fare as well, as his head ended up behind the side curtain.
One thing I wonder about with any of these trucks in a real offset crash, though, is the aspect of how the other vehicle plays in. These IIHS crash tests involve them crashing into an immovable object (brick wall). In reality, those offset crashes are typically going to be on something like a 2-lane road where the other object is going to be another vehicle which IS movable. Obviously that means it varies, but if I'm crashing into a Prius or the like, I'm going to have an inherent mass advantage. If you crash into a semi, then you're worse off.
Either way, seems that the 3500 was the safer truck to get than the 1500, although it wouldn't surprise me if Jesse's 1500 did better in a crash test than my 3500. I'm not about to find out for real which one of our trucks does better head-to-head, though.