You describe a "remote" need within the full set of trucks owners, pun intended. There are not enough of you to justify any volume sales of "~680 mi range" with current technology. There's a reason you didn't see any other vehicles on that mountain you went to so far away.I suspect they will offer extended ranges once the competition is serious enough to force them to do so, and battery supplies and chemistries enable it. But for several more years at least they won't. A 500 mile range is a minimum where we are in the American charging desert of the Rocky mountain states, at least if you hope to venture outside the small home charging and interstate charger radius for any sort of backcountry excursions when and where cold temperatures are common. I saw the writing on the wall early last year and just bought another Jeep cherokee that gives me that range in all conditions. Will check back around 2030 when this one's worn out to see about viable BEV or hybrid options. Unless we see dramatic plans to start densifying the charging network in the Rockies soon, an extended range hybrid vehicle like that offered in the RAM trucks next year with ~680 miles of range will be the best reduced carbon alternative.
I think it's great that others offer an EV solution here, same with Lucid in fact. But they will likely be niche and may not survive long term. If I were to go on an adventure beyond typical range, I'd also bring additional power with me - be it panels, more batteries, a generator, induction charging from High Power Lines, whatever...