Not true at all, You can easily put 12-15 psi on the 3.0's, I ran 20 psi on a relatively internally stock motor with a Whipple that had 100K+ on it for almost a year, with no problems. It finally stretched a rod bolt & blew @ 6000 rpm, it was beat on daily & I never worried about hurting it, hell I tried to hit the limits on it. The heads & pistons were clean when I took it apart, no carbon deposits anywhere.
You will need a great tune, Larger injectors, & MAF
you will need to run premium fuel or an E85 mix to increase octane.
Water injection when done correctly & a great tune can eliminate the detonation problems, & if you don't eliminate them you will burn a piston
I am running 18 psi now on my daily driver, and I can even run on 89 octane with a minor adjustment to the H20 system controller, (turning a dial in the cab)
As for the original question regarding a pro-charger, I am sure it can be done, bear in mind its more than likely all going to be custom brackets, intake tubing
oil lines etc. Just depends on your fabrication skill levels & wallet limit.
So it is doable, and yes there is work & money involved, but the same holds true with the 2.3 & 4.0 or any engine when you start modding like this.