The boat lives on the dolly. It's pretty simple, the dolly is just a single axle with two short bunks. There is a long extension with a trailer hitch that pins on at the axle. I can trailer the boat back and forth to the beach with the dolly, once I remove the extension I can roll her right into the water and when she is floating we just pull the dolly out from under the stern. The trick is to keep the axle in the sweet spot under the boat so you can easily balance the bow up or down and roll the boat around - I use heavy duty ratchet ties to keep it in place. Retrieval is just the opposite - keep the bow out to sea, shove the dolly under the stern and strap it on, pull her out of the water with a long rope attached to the truck, pin the extension on and trailer her home.
You can see the extension under the boat in this photo.
Here she is without the extension.
Here she is behind the truck.
It's really quite ingenious, you just have to think like an Egyptian. You wouldn't want to trailer down the highway with this rig but it allows me to launch safely even when there is surf because I can launch bow out. I have a third wheel on my trailer but I found driving onto the trailer with following breakers quite difficult and somewhat dangerous. We even used all galvanized metal and added bearing buddies to keep maintenance to a minimum.
If I want to trailer someplace I just retrieve the boat with the highway trailer for the next trip out of town. I've got thirty miles of graded dirt road to go anywhere so I don't go out of town too often with the boat.
