Another carseat question: in a truck??

Ardmhs83

I know everybody is probably tired of carseat questions, but I am wondering if any of you all have a rear facing carseat in a truck.  We have a Toyota Tundra (w/ the suicide doors) and we have yet to get a carseat for it.  We have the Graco Snug Ride 65 or whatever it is called in our car and we like it, but it looks way to big to fit in our truck.  Any suggestions for carseats that fit great in trucks that aren't too, too expensive?

Thanks so much if you can help! :-)