if u want some real good sound in a ute and dont wana make any body mods den do the ffg:

Go with 2 8" rather than the 10"
Mount them on your doors at the bottom using a spacer bout 50mm to give it a good solid sound. Make sure your door pads are nice n tight cos it rattles alot but inside the cab u cant hear it. Your complete door acts as a box. Think the only thing that you might have to cut is a bit of metal on the door frame. I have the same set up and it CRANKS!

My set up is:
-JVC MP3 50*4 front loader
-Linertec LT-7 passive cross over
-Audio Bank 100*2 amp (for the subs)
-Pioneer 6" 120w 3ways on the side pannels for mid (of the deck)
-1" tweeters mounted on the dash (of the deck)