Didn't Come With Instructions

I just bought a new boat and decided to take 'er for the maiden voyage this past weekend.

This is my first boat and I wasn't quite sure of the exact Standard Operating Procedures for launching it off a ramp, but I figured it couldn't be too hard. I consulted my local boat dealer for advice, but they just said "don't let the trailer get too deep when you are trying to launch the boat".

Well, I don't know what they meant by that as I could barely get the trailer in the water at all!

The stupid truck would die and start floating before the trailer even got close to deep enough!

What am I doing wrong? Should I load the truck down with some lead or maybe rocks so it doesn't float?

Anyhow, here's a picture.
See for yourself.
What am I doing wrong?

Darn, Hate to see an American Ford Truck Wasted