Why in the world would you want to extend your general liability umbrella
coverage to any one but your family?
If you were smart...........you would pay zero extra as the changes have
no effect on you.
At a couple of ramps I use, I sometimes have to "manhandle" the boat onto
the trailer properly while someone else handles the tow vehicle. Or, at
launch, I sometimes stay in the boat while someone else backs down the
trailer. **** happens. I'd want coverage for nasty things happening at
those times, since I can't handle everything at once.
You are still covered as is your boat...............same as you always were.
The other guy however is no longer covered by your gl umbrella coverage nor
should he be.