Moving the bar forward but actually caring about what's cost effective, wouldn't a normal gearset in the front of a 4wd truck (say 4.10:1) be sufficient for 10 mph?
I personally would want more like 65 mph possible or what's the point of dragging around 100s if not 1000 pounds of extra gear.
The added generator is also a bad idea. The ICE motor is the already 10 times more powerful generator.
I did see on the Jeep 4XE (supposedly the #1 selling PHEV last quarter) you can turn on and off the EV modes saving the battery for when you want, or put it in a generator mode where it adds to the charge. Pretty cool. And it runs 8.8 sec 1/8 mile drag racing although the guy did pull out the rear seat and spare tire (common drag racing hacks.) That's generation 4 or 5 Corvette territory. I bet 0-60 it would probably beat the c5 vette as the 1/8 mile is more like 0-75 mph.
https://youtu.be/Reo57YMcH_0