I suspect this truck was used between 1900 and 1910 in Los Angeles. What
is the make, model and year of this car and where would someone
have purchased this (new) in Los Angeles during this time?
(http://photos.yahoo.com/mprohias@pacbell.net/) in the "angona winery
album"

When I saw the photo of the Angona Winery truck I thought the front
end looked like a Model T Ford. I did a little searching and found
this:

http://www.modelt.org/gallery/pic.asp?iCat=46&iPic=118

http://users.wclynx.com/theshaws/marty_trucks.html

http://www.mtfca.com/encyclo/1924.htm

MODEL YEAR DATES: August 1923 to August 1924.

BODY TYPES: Touring, Runabout, Tudor and Fordor Sedans, Coupe, Chassis
and ?C? Cab Truck.

I am pretty sure that the Angona Winery truck is a Model T Ford "C"
Cab truck. If the info on the last link is true, it would not have
been available until August 1923.

Yeah, I looked at lots of trucks too. Those Fords that Redhoss shows
have almost  horizontal hoods (very typical for T-models), but the
winery truck's has a slope. I didn't find it, but I think it is
pre-1920.  I saw a very similar ones on a site with Hercules truck
frames for Ford T-models.  Nowhere did I see such and open cab, but
that could be special for S. Cal.

A while back there was a question about cars, and I found the site of
an auto club in Surrey, England, that seem to like to discuss the
identification of old vehicles.

If you search here with my user name and Cars you can probably find it.