That's what I was thinking as well. Without going down the Dana-Spicer catalog rabbit hole, it looks like the Dana 44 is something of a series, where MXXX refers to the ring gear diameter (bigger is heavier duty). So, I guess everyone just went to Dana and said, "axle please!" and they all got the "mid-size" spec. Actually, that's not true, because I'm only looking at the top spec models; lesser models get lesser axles.
Notably, the link above shows the JL(U)R gets an M210 front where the Colorado gets an M200. I'm guessing the delta is due to either the more robust nature of the solid axle design being able to take a heavier load or Jeep's expectation that the user will beat on it harder or fit bigger tires or something. I doubt 10mm is a huge difference, but it's there. I can't find what the Ranger has for a front axle... Toyota makes their own axles last I checked.
I don't know how or if this would hold any weight, but GM has made a bid for a military vehicle contract that's essentially a diesel Bison with no emissions and a different body. They haven't won the contract yet, but if they do, that seems like a vote of confidence. They're definitely getting the most press of all the entrants. I'm pretty sure I read that Jeep made an effort with a Gladiator-based design; very little appeared to have been changed from what you'd buy as a civilian, but it also doesn't appear they made it to the current round. It's sort of just a "neat" data point, but what it means long term if you know where to look is a bunch of really cheap lightly used parts down the road. On that same note, I don't know what it's like in your neck of the woods, but around here, nearly every commercial and municipal vehicle is a Summit White extended cab 4v4 Colorado WT. If it's similar around you, that means a ton of spare body parts down the road should you need them. They're all gas, so there's some significant drivetrain parts as well since that's your intended route. If you get yours in Summit White, you don't even need to bother with paint! Between the military truck spares and the work truck spares, you would be able to stay on the road for a long time very inexpensively.