My 32' Winnebago sleeps me, wife, kids and dogs has a 4000w generator and 3000w inverter which runs off two golf cart batteries charged by shore, generator, alternator and 300w of solar.
It has 80 gallons of gas, 70 gallons of water, air conditioning, and giant awning and tons of storage. I carry just about all my tools.
It even has a built in desk in the passenger side dash which I can work remote from using the hotspot / router with external antenna.
I driven cross country multiple times towing my Jeep and taken it pretty far off the grid. Its not an off-road vehicle but you would be surprised.
There are a lot of choices in between mine and a Unicat as well, like a 4x4 Class B or Super C. Some of them are starting to do large 48v secondary alternators with lithium banks and no generator while still being able to run the A/C for up to 8 hours before recharging.