Can I supercharge my 2008 4.2 liter V6 Ford F150

yup you sure can. You can put a vortech supercharger.
you can even have a dealer put one on

its possible to if you want a supercharged car but they have enough power already

You can, but does anyone sell them for that engine?

Sure you can. l am assuming vortec makes a kit. look into kb or whipple for a twin screw.

Yes. Why did not you buy a truck with a V8 engine. The V8 would have gotten better gas mileage, and the cost to supercharger the V6 is a whole lot more that if you bought one with a V8 in the first place. The V6 will never have the torque of a V8!

Yeah you can. However you will spend much more money for this upgrade that you would have had you just bought a 5.4L truck to begins with. You will need to run premium fuel and you will need a custom tune to keep everything running as it should as well.

Sure just ask Jack Roush, he does it all the time, great add on for the v6. and you will be surprised.