We have a '94 F150. We specifically saved up for the money just for the Britax just so we could have a seat that RF tethers for in his pickup. I do not want her rebounding into the glass window! And the RF tether prevents that (the FPSV doesn't have RF tether)
I wanted the seat installed in the middle, to keep her away from the doors and so that I could have a shoulder belt, but it was an absolute BEAR to install in the center. I actually ended up removing the RF lockoffs (btw, please don't do this w/o talking to Britax first) and even then it still took 2 people and half an hour to install it in the middle.
So if we had time, I installed it in the middle, but if we didn't have much time I just put it on the side (switchable retractor)
The only thing is that the switchable retractor made the seat tilt after a while *sigh*
So we ended up just putting the lock-offs back on, and putting the seat on the side and using the lock-off instead of the retractor.
Oh, and one thing that helped me a lot with install in this vehicle, is that Britax told me that you can have the seat in the upright mode while RFing. When I installed it in the normal RF recline mode, it made the seat way to reclined. Just something you may want to keep in mind.
Also, Britax told me that I could tether to the vehicle bench seat, as long as the spot was directly below. So it could go straight down (and within 20 degrees side to side) but it couldn't go below the child restraint. Does that make sense? So they either want it tethered to something in front of the child restraint (towards the dash) or something straight down, but you can't go under the child restraint (towards the bed) And going side to side it must be within 20 degrees of the center.
Boy I hope that my post wasn't really, really confusing. Please ask if I confused you on anything I said