Hi Robin,
Welcome to the group and to one of the greatest, if not the greatest, trailer made. We live in the east bay too (Richmond). Haven't had any dealings with the folks at Dinuba, but have heard good things about them over the years.
We have the same trailer, but ours came with a 20gal tank. I know the literature says 11, but there was a sticker by the door that indicated otherwise. And I measured it and the capacicty was over 20 gals by cubic volume. I was also under the impression that ours was 30a, but will make note to check it next time I visit it (we don't have a garage for it unfortunately).
Start at the beginning of these postings and read all the posts and you'll have a wealth of knowledge rarely available to new owners of other rigs.
Feel free to contact me offlist if you'd like to talk about your new "toy"
Jim