Not sure if the cabin interior is similar to the truck, as they claim to share the same chassis, but I had a late 90s pickup that I unbolted the rear "split bench" seats, and bolted in a piece of 3/4" ply to give me a large flat space for "whatever".
Might want to visit a used car lot and poke around with a flashlight, I would wager the seats un-bolt. Having them welded in makes no sense from a manufacturing perspective.
You will have foot wells, the transmission / drive shaft tunnel and possible rear wheel wells "in the way" when you remove the seats, it won't be a nice flat floor.
