John,
I can vouch for that as well at Golden Gate. I basically saw the guy all the time. Even in mornings...
I've got an OT story to go with this...
One morning I got out to the Golden Gate and hooked up with two ''sheets to the wind'' Irish lads who, turns out, had just gotten off their night shift bartending. I mean these guys were so gone I was keeping my distance (e.g. drunk Irishman with stick = probably not good).
Anyway, these two fellas immediately started to thrash my ass. Granted I was a newbie, but I couln't believe it. Fast forward now and sure enough ... guess who pops out of the woods like some elixir fairie. Yes, the beer guy. Low and behold the two lads just about clean out this guys stash. One of the lads turns to me and says in some inaudible Irish '' I think you need a brew the way you're playing''. I have to admit I was very close to joining in, but I told myself I was bound to have few strokes in the bag at some point. They were so irritated by my refusal that they somehow stepped it up a notch and started to play even better.
Well there never were any strokes in the bag that day and I just about quite this stupid game to go back to soccer. The fellas faded towards the end a little (e.g. too much hair of the dog I guess), but I took my beating nonetheless.
Moral of the story ... drink up when two drunk Irishman offer you beers on an early morning at Golden Gate and they're beating your pants off.
True story.
As to the gentleman selling beer out of his car it must be an SF muni golf thing. My son and I played the short 9 hole course in Golden Gate park and suddenly out of the park a man appears with a very large messenger bag filled with ice cokes, and beer. Admittedly unexpected he was quite nice offered his goods and moved on. The two older gentleman who were regulars said he was there most days.
I guess the walk to Lincoln is too long or the beer car salesman has that franchise.