2006 Explorer 4.6 v8 has no power to tow up mountains?

You are not letting the Explorer work. You are not use to letting it rev to 4500-5,000 RPM to climb a grade. Let it work. That's what it was designed to do.

I pull much more than 1,500 lbs with my Minivan and it does a great job but I let it work.

Let it rev...you are not going to hurt it. If your F450 had a V10 it would be running 4,500-5,000 rpm to tow up mountains too...it's the nature of a gasser.

Thanks!

Jeremiah