No dumb questions here.. Body lifts are usually added to gain tire clearance and just going up 1-2 inches is probably not going to get you much but I'm sure you could find some spacers in the 1-2 inch range if you talked to a shop that specializes in lifts but why bother..
And yes AV's and Suburban's sit on the same frame almost anything suspension related will fit as will most Silverado pieces but not all..