Ahh, a house car, lot of those started life up in Oregon, check out Mr Sharkeys home page for house car stories and such.
Nice straight truck I don't think you'll see anywhere close to 10 mpg with that over head on there, unless you run the back roads at a leasurey 40 mph, Greigg's is correct Napa will have or can get in most cases over night many small parts, if the tires have some age on them, like maybe 5 to 7 years old you may want to purchase one as a spare, a lot of tire shops don't carry 10:20 anymore and it never fails something will go haywire on a Friday.
This will be a fun adventure, enjoy it.