These are the numbers before I upgraded from my roof rack to the J30; other than the top being a bit lighter, everything else remains the same:
Full aux. (20 @ 6#) and main tanks (42.5 @ 6#) full, water tank (10.6 @ 8.35 = 88.51) empty, tent and camping gear, plus driver
l/f 1400
r/f 1250...