Heh...there was this dopey guy at the ramp one day, and...ok, it was me.
I was launching my 19 single-handed, at a ramp I'd not used a whole bunch. Backed down a bit, disconnected the safety chain/winch strap, then hopped back in the truck to back her all the way in.
Got to the point where I was pretty sure she would float off, and put the truck in park. Had the boat within a foot of the dock. Grabbed the bow/stern lines, and proceeded to give the boat a tug. The boat moved, but not enough to release from the bunks.
Back to the truck, backed in right up to the rear truck tires. Back to the dock, grabbed the lines, and gave it a tug...nuttin'.
I was sure I was in enough water...got down on my knees and grabbed the stern cleat, and really started shaking the boat back and forth...I thought perhaps it was just a very shallow ramp, and was dealing with bunk stickage. However, the boat moved easily back and forth....at which time, I noticed the trailer was moving right along with it.
Damn trailer tie-down straps.
Actually, the above just got me to thinking. One could keep the bow strap connected along with the stern straps, then disconnect the trailer from the truck. Launch with the trailer attached. Then, have your spouse drive the tow rig onto the ferry, while you putt slowly across Puget Sound, meeting them at your destination. Truck comes off the ferry, hitches back up at a local ramp, and you're on your way.
One could save a bunch on ferry fares...those extra length surcharges are nasty. Any rednecks in Puget Sound wanna go first?