When I bought my GV a couple of years ago one of the first things I made for it was a demountable bike rack that hangs from the spare tyre holder.
I hate any bike rack system that do not allow you to open the rear door and also obscures the number plate. This is what I came up with:
50x50x5 square "T" welded inside the holder. The socket lines up with a spoke hole in the wheel.

The rack is made from a "L" of 40x40x4 with thick 1" tube forks and a brace. The forks appear offset to the bracket to line the forks with the centre of the car. The forks have 1" rubber hose for a bulletproof stiff padding.

the lock is a 40x40 square plate with a long pin along the bottom of the "L" that is stiff to twist. When twisted 45degrees the rack cant move back out of the socket.

I have made a few of these for family, (GV3, Prado, camper trailer)
