To bring this one back from the dead. I am a father of 2 and have a King Cab truck. Though the youngest (3 months) has never ridden in the truck I have a lot of experience with car seats and our trucks.
As in infant I found that I could easily carry just the baby and I . Baby in the passenger side extra cab, infant carrier, rear facing, no base, car seat extender flipped out, just the seat belt, shot gun seat all the forward or flipped down head rest off all the way forward.
Front facing. No latch system. Use seat belt. The anchor is a little tricky. The behind the head anchor is a pivot for the anchor strap. Put the anchor strap through it so that it is redirected to the floor between the two jump seats. Right between the two jump seat seat belts in the middle is the actual anchor. It is a small black steel loop. The shotgun seat still needs to be all the way forward or flipped down.
Now my oldest rides in a high back booster. With the booster someone can ride in the shot gun seat. Granted it is a bit forward, but not stuffed into the dash forward. I wanted a harnessed booster but those are too thick. in order to accommodate the harness straps the back of the booster needs to have molded sections and extra depth.
Technically you can have a car seat in the front seat. The seat has a weight sensor in it. If is senses weight and it is under 100lbs it will shut off the passenger side air bag. Place a back pack or your dog on the seat and you sill see that the no air bag light lights up.
I feel very good about having a car seat in the jump seat spot, especially with the front seat up. They are well protected.
Though a crew cab would be nice I just can deal with having one. First this is a truck and I need it for truck things. Like carrying a ton of stuff in the bed. Can't deal with a bed even smaller than the one I have now. 2nd I use this truck to off road. No locker option in the CC Long bed, and I doubt that behemoth of a truck will be able to get where I want it to go. I already have enough trouble with this current truck getting to places that a mini would have easily gone.
Instead we just bought a new RAV4 to haul the babies around in.