I was debating cutting my 4runner up so I'd have a functional bed. every now & then the idea starts to itch. I researched it pretty deep... You can move the power window behind the rear seats or put a regular pickup window in there, get a snap on soft cover jeep style.. flat bed.. lots of possibility with creativity. heres how it broke down for me:
Pros:
- Major weight reduction
- pickup bed for hauling junk like tree limbs etc
- One-of a kind truck
Cons:
- bed will be very small
- when I go camping, I can't sleep in the truck
- When shopping, can't lock stuff up
- Lots of work

It's a close, creative, but still no cigar situation. the 4runner's wheel base isn't long enough for a 4door pickup. We have like a 106" wheel base. I measured my dad's S10 4door, somin like 128" wheel base. Same thing with a Xcab pickups 128". I came to the conclusion that being a SUV was more useful than being half SUV/pickup. B/c when you're inbetween you don't get the perks of either! Think about it for a few weeks before getting the grinder out!