Need suggestions for a removable or mobile fence for a parking spot next to the garage
Are you permitted to build out into the driveway toward the street? You could sink a post to the left and right (anchoring the right post to the face of the brick garage). Frame it across the top, hang an upper tubular guide, and build a hanging sliding panel in front of the boat. The panel would span the left ~2/3 of the opening in front of the boat and roll to the right when access is needed.

You could frame up a smaller swinging gate to the right of where the sliding panel is. The sliding panel would cover the swinging gate and part of the garage when open, when closed it  would be like a fence. Something kinda like this: