Yes. Without hesitation. PHEV would solve all of my hangups about the hybrid. It has more than enough power. Just not for long enough. A 20kwh battery would allow you to both have full EV output up the entire length of every major pass in the USA making towing capability better than the TTv6. And it would have enough battery capacity to regen all the way down saving significantly on fuel. Not to mention that something like 25-30 miles of range would cover almost every local trip I make without needing to fire up the engine significantly extending the engine lifespan. On the trails - silent crawling would be incredibly cool. And ideally full VTG capability for powering the camp stuff or your house or ??
If Toyota actually has sorted out the solid state battery problems, the packaging could be smaller and lighter than the current battery. At 300wh/kg, a 20kwh battery would weigh about 150lbs (for the cells, fully battery pack would maybe be 300lbs.)
I'd also be fine with something like a 200hp NA 4cyl that's very well balanced and a 50kwh battery pack PHEV that is more like an EV plus range extender engine. I think Ram is on the right track with its truck design. With solid state batteries we're talking about only around 400lbs for the batteries plus the packaging. I would still prefer to drive it through a single center mounted motor or two. - Whatever the case may be - I'd want the axles mechanically linked. But that would possibly be even better than a more mild PHEV.
Just some food for thought as far as HEV vs PHEV vs BEV
IMO PHEVs would be preferable in the majority of vehicles if battery production was higher. But in a battery constrained world - HEV uses the limited battery capacity most intensely so it results in the most benefit possible in terms of overall emissions reduction and fuel savings.
Just rough numbers - a hybrid Rav4 vs regular gas version saves about 125 gallons of gas per year at 15k miles per year driven. A PHEV Rav4 would save roughly 350 gallons vs a normal one (assuming about 50% electric). But the Rav4 Prime takes 10 times as much battery capacity to roughly double the fuel savings. A Tesla Model Y saves 500 gallons of fuel per year.
Per kwh of battery you get
HEV 62.5 gal/kwh/yr
PHEV 19.5 gal/kwh/yr
EV 6.1 gal/kwh/yr
The same is roughly true for overall emissions savings. It depends on your grid, but in every case HEV beats PHEV and EV on emission reduction per kwh of battery used. If every cell in ever Tesla were used to make all new cars BEVs or PHEVs, we'd save about 10 times as much gas. Something on the order of 20 billion gallons of gas in the USA annually. That's a lot of oil we can sell to other countries and/or not buy from people we generally don't align with.
I actually have a different suggestion.
How about gasoline electric like a locomotive?
(sorry about replying w/ the quote but w/o actually typing anything, clicked the wrong button)
At any rate, this configuration would guarantee the engine works at max thermal efficiency and electric motors put out power 100% of the time. You can get rid of the transmission and transfercase and opt for some really nice locking differentials instead.
This solves the issue of packaging.
That said, PHEV is the most efficient use of existing battery manufacturing capacity since most people do most of their miles in <100 mile daily commutes.
Someone in Europe made a hybrid powerplant like this for the Tesla Model 3. Gives it 621 miles of range w/ a 17kw battery replacing the oem battery with a two piston range extender gasoline generator. Generator runs 100% of the time >45mph but runs at its most at its most efficient speed. Also, there's almost no vibration with the engine in that generator since it's harmonically balanced to perfection.
LC250 with an electric powerplant running on gasoline might be a weird feeling, but having 20KW of LiFePO4 batteries that last between 3000-5000 cycles sounds like a good option. Especially since it can run the heat pumps during winter / summer trail runs.
My biggest issue is idle fuel usage. When I'm in Alaska in the winter, we have to deal with -60°F Windchill when the actual temp is much higher at -20°F.
The problem is, the wind sucks heat out of the vehicle. Whether it be in my Tacoma or Land Cruiser, I have to keep the engine running if i'm sleeping overnight inside the camper or in the back of the 200. The other option would be to carry a gas generator on a trailer.
LC250 with gas generator and all electric drivetrain would completely solve this problem.
Also, I think it's really funny how people complain about a 2.4L Turbo from Toyota in that it has to be unreliable compared to a V6 or a V8, yet fail to remember Toyota's former reliability kings, the Inline-6 Engine (1JZ/2JZ) and 4-Cylinder engine (22RE/22RTE). Not putting shade on the 2UZ, since that's a magnificent engine as well, but Toyota's been in the engine business longer than any one of us, and this whole start stop Hybrid configuration is what is killing engines.
Once Toyota physically divorces the electric drivetrain from the internal combustion engine, the sooner we get reliability back.