1) Put in a factory assembly or
2) Get an aftermarket one (like mtx thunderform, jl stealthbox, etc) or
3) Custom make your own (like I did w/fiberglass and mdf)
Then you can fit one 8" or 10" sub. Just need to be aware of depth of the sub and airspace needs.
After that, its just a matter of finding a place to hide the amp.
Any other boxes will either go under the 2nd row seats or in the third row area.
Another possibility would be to make an enclosure where the center console is. I know some of the F150 guys go this route...
Edit: If you are going with a single 8" or 10" in one of these small sealed enclosures you might be disappointed with the results...especially if you are comparing it to your friends' set ups (which probably have multiple subs, larger subs, more airspace, more power, etc)