I store my non-restricted rifles loose in the back, tucking the muzzles into that cutout on the right side. All my restricted firearms (AR, pistols) are cased up and either in the back or on the back seat.
I had a chuckle, I got pulled over speeding on the way to meet a friend at the range. Big stack of guns, cases and ammo boxes in the back and on the back seat. Never said a word to me about it.