I'm pretty sure Bigfoot
started using that style of tail light
in 1992. Prior years had the Miro-Flex tail lights
That being said, nothing else in these pictures adds up to any year Bigfoot I recognize. The front window looks original but none of the side windows nor rear window do. They are not the original size, location, or style.
The hatch door in the back isn't original. There are no storage compartment doors on the sides, and no water heater door, or fridge
vents. The furnace
vent is in the right front quadrant and down low, not the original location.
If this is a 1994, I suspect it has had major
fiberglass work done to it. Pix of the interior might yield some more clues.