The only way I have seen to protect your boat during long trips is to cover your boat. The methods mentioned above, work to a degree, but you still have to wash your boat. Also some soaps turn to slime when mixed with salt water so you go really fast off the tramp and into the water if you cover your boat with soap and don't get all the soap off.

You can use a covered trailer, have a custom cover made or use plastic wrap. The plastic wrap is cheapest, is easier to take on and off than a custom cover and is a low investment so if you don't like it you can stop.

The plastic film I use was made for airlines to cover luggage. It is a super saranwarap that only sticks to itself. I use it to cover the bow when I don't feel like putting the cover on

To apply it, put the roll on a stick and wrap the parts of the boat you want to stay clean. To remove it, slide a knife under it and cut it.

I can't tell you where to buy it because mine was given to me. But they used to offer to wrap your luggage with it in the Miami Airport.

Also it seems only fair that the strongest person should wrap the boats.

Carl