I'm nugget shooting in AZ. I'm new to the GPAA and I've only been to the first two sites listed in Pima County in the online guide. I don't know how good the gold is, haven't found any yet. But if you're looking for lead or brass nuggets they are plentiful. You could probably grab a pound a day easily without digging - 5x that if you've go under the surface. It won't make you rich, but it might pay for the gas. :)
They're both on BLM land and have lots of camping spots around. The Friendship/Maybe claims you can easily drive an RV onto and camp right there. The Golden Tattoo group you'd have to camp on the edge of. The roads into the middle are 4WD.