Actually only the tape measure dimensions are the same. Payload capacity and weight of vehicle are a whole bunch different and ride will suffer if not loaded to capacity. 1/2 ton trucks have an excellent payload as long as it's not exceeded. It is very important to figure out what weight you plan on loading then size accordingly.
I don't disagree with your point, but to add a bit of context to the choice between full or midsize trucks: 1/2 ton trucks have a better payload than mid-size, but it's not that much better when all is considered. I've shared this example before but I have both a full size truck and a mid size truck. The full size truck only offers about 350 lbs more payload than my midsize truck. However, it's about a thousand pounds heavier overall, and the footprint is much bigger, so the scant advantage of 350 lbs in payload is quickly washed away by the disadvantages of the size in other respects. Fuel economy is about the same, so that's a wash. If I were to go for a full size truck, I would go for one of the HD offerings because if my needs could be met with the half-ton, odds are with minimal sacrifice I can make them work just as well in the mid-size and not have to worry about the disadvantages.
Your overall point is spot on though and I totally agree with you -- one has to figure out what weight they plan on first, and then size accordingly; which brings me to my next point for the OP as figuring out those weights is an important step. And there are needs beyond weight to consider too -- there may be other advantages to the 1500 series trucks for some users that don't apply to me (for example, cab space is not high on my priority list, but it's immensely better in the full size as compared to the mid-size which might make the 1500 series more attractive for others).
(I should also mention that not all 1500-series are the same; I've learned from users of this forum that Ford has a high payload option which is definitely an exception to the above observation).
We're looking to be independent for about a week at a time so less than 50 gallons would get us, but we haven't settled on exactly what we'll need as we need to do some more testing.
This is what I've seen as well, I haven't found the 3.5 anywhere, it's all been a 2.0l diesel. I have no desire for the turbo motor. We'll be in no hurry to get anywhere and plan on just moseying around.
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I emphasized the "Testing" above because that's exactly what I was going to suggest. From personal experience, I have travelled around the world out of a backpack. I had all my stuff that I thought I needed to meet my needs. About a month in, there was a large box of "essentials" on it's way to my parents house -- there was a ton of stuff I just didn't need after all. My first time doing any adventure travel on a motorbike was the same; I had a ton of stuff I didn't really need or use and left behind more and more as I travelled more frequently. And, our approach to our 4x4 touring has the same pattern.
When we finally settled on a mid-size for our needs, we did so because we wanted the maximum payload available (at the time) in a mid-size footprint because of exactly what you've described -- we don't want to limit where we can go, and a North American "Mid size" is a "normal sized" vehicle pretty much everywhere else in the world. We were coming from a Jeep, so we had our system pretty dialled in, but we went through a huge process just to make sure we were making the right call because in reality we actually wanted to keep our jeep, but that would mean fitting an 850lbs payload. We already knew what our "essentials" were because we had travelled so much -- if you don't have that figured out yet, as my story above illustrates, I'd test the heck out of your systems on longer trips and figure out what's a "must have" versus a "nice to have". I also suggest ranking according to flexibility -- what are you least willing to compromise on? And what are you most willing to compromise on? That's a slightly different lens than "must" and "nice" that can help with deciding what you actually bring with you.
Anyway, once we had our system dialled in and knew exactly what we needed for long-term living, we busted out the scale and weighed everything we intended to bring with us. I mean everything, right down to the toothbrushes. We then researched lighter alternatives -- again, for everything, including considering titanium cutlery; grams and ounces add up fast. Some stuff was obvious -- swapping a metal winch line for synthetic for instance (Still TBD for us, but it's on the list!). Other stuff was a bit more of a cost benefit analysis -- is it worth spending hundreds on a titanium fork to save 3 grams? Not for us. You might find that if you do a similar exercise with your "must have" items, you will similarly be able to shave a fair bit of weight by looking to alternatives, which might help you get into a payload range of a vehicle with the footprint you desire.
There are also other compromises you can explore - when you are away from civilization for over a week, are you also far away from water? In our case, we like to shower daily, cook and clean as you've described, and all we use is a 5 gallon jerry can. But we make due for several weeks at a time just fine because invariably, we encounter water somewhere in a day and can refill (and have a pump and filter system that allows us to do so easily and safely from virtually anywhere). We had to do that because we didn't have the payload for extra water storage. When we are going to places where water is less available (i.e. arid climates), we acquire some extra water just for those times and accept that we'll be a bit heavy, but for the majority of our trips we are able to resupply more often and avoid the weight penalty.
And finally -- there's a vehicle that checks literally ALL my boxes and will likely be the next overland rig for me, and it might be for you too as there's currently nothing quite like it on the market except maybe the LC Troopy. The Ineos Grenadier is promising the "Mid-size" footprint with a 2000 lbs payload; if they deliver on this promise it will have a lot going for it as an overloading rig and so if your purchase timeline is next year, you might want to look into it (they are slated to be up for pre-orders at the end of this year, I think).