Anything newer than '89 should be a 16 gallon tank from the factory, that's what my '90 base model has, I have the manual it says that's the smallest tank in the owners manual I have around somewhere... but yes, the 21 gallon tank is most common on extended cabs, that's what my '97 has, it's nice going 400 miles per tank!
This is in reverse order, but bite me
. This first picture is when I proposed in 2016, somehow it was a complete surprise... had the ring in the center console, she wanted some jerky she knew was in there on the way to the coast, I told her I'd get it... no clue... went to screw around on the dunes for a bit, weather was coming in fast and getting dark so I asked... Before anyone asks, the dangly bit by the rear diff is my vent hose... it's zip tied up better now.
This one was a bit worse for wear... Early along in the turbo swap days so I think 2010 or 2011 I remote mounted the DIS module, and I didn't ground the plate I mounted it to and it would randomly stall out... out camping about 250 miles from home (I drove it there...) I finally got up the nerve to side hill around a bowl in the sand and it decided the apex of the curve was the right time to stall, had a friend in the passenger seat too... it rolled I think 1 1/4 times landing on the drivers side, the jeep behind me winched me back upright within a couple minutes... I had some 10 year old BFG MT's on it at the time so they blew beads when you looked at them wrong, so 3 of them did that... had to cut the drivers seat belt (buckle was full of sand), my buddy broke his collar bone on the seat belt and I lost one of the slider panes and dented almost everything (missed the hood and tailgate). I think that was the last dunes ride of that weekend for the ol Ranger, I think it was Friday morning... I drove the thing home with a broken windshield and no drivers seat belt just fine. I can be very determined so I did all the work myself, pulled the front fenders and pounded them out, pulled door panels and pushed them out the best I could, took a porta power to the A pillar to straighten it out, pulled the roof skin to straighten it (couldn't find a replacement and no headliner as you can see so had to...) and took measurements from a junkyard to get a windshield to fit again and it's been going for like a decade
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That's about it for the epic Ranger journeys for me, there's other stories but these top the list