I can attest to the fact people modify new or near 4x4s as I took our 2016 LC to Moab in March 2018 days after I bought it and added a lift, sliders and tires...and more than one person thought I was crazy taking it on Metal Masher and Wipeout Hill to break it in
Something to keep in mind with an EV is there are far fewer things you need to modify:
You don't need: a snorkel because there is no internal combustion engine
You don't need: lockers or gears because there is no differential and instead you have instant MEGA torque along with torque vectoring and lightning fast traction control
You don't need: tcase gears because there is no mechanical link front to rear (I'd argue almost no one adds aftermarket tcase gears for vehicles made in the last decade and almost certainly won't be available for future vehicles)
You don't need: (in the case of a Rivian) a lift kit because it has air suspension with over 6" of travel and 15" of ground clearance in the highest mode which is several inches higher than any other stock and 3.5" more than a 200 on 35s
The concept of a long range fuel tank is interesting, but I would argue the vast majority of vehicles you see on the trail do not have long range fuel tanks. I personally am not crazy about them because it seems they all need some custom work and massaging to get them to work properly on modern vehicles, and it adds a potential failure point especially with evap, emissions, and check engine lights - which in modern vehicles can put the whole truck into limp mode and disable the ability to put it in/out of 4 low like the 200 series.
Regarding range off road, something to consider is that an ICE vehicle loses energy any time braking occurs, but an EV can actually add energy back into the battery pack via regenerative braking instead of that energy getting lost via mechanical braking or engine braking. I can share from first hand experience coming down steep grades like switchbacks adds miles of charge back into the battery while also making it much easier to drive because your feet aren't dancing between the pedals. As an enthusiast, I was honestly worried about range off road. And then I did trip after trip off road in an EV, and I ended up at times being more concerned about finding gas for the 200 than an EV charger.
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