[Latitude 28]

Not sure if this help you visualize parking in your situation.  Take a look at the attached picture.   For us with a non-steering tag look at my track when backing into our driveway.  The concrete at the gate post is exactly 19 feet.  Distance between the gates is about 19' 6".  My driveway apron needs to be about 4' wider on this side to accommodate the turn radius.  While backing, my Wife is spotting and says the passenger side rear corner is about 18 to 24" away from the far gate post.  The street is 20' 6" wide and my passenger front wheel track is right on the edge of the far side of the pavement.  If I am lucky and the stars all in alignment I can do it without pulling forward to reposition.  

Steve