Most bulky:
1cy of bagged (14 2cf bags, stored inside) cedar mulch, along with 300 lbs of bagged stone. The combination fit, but was probably too much weight.
Longest inside:
9'x13' area rug (rolled, riding at an angle from back left to front right on dash).
Longest inside/outside:
30 gal crape myrtle (about 15' from stem to stern). Container in the back, tree going through front passenger window, over mirror, and bent around hood, tied to license plate.