[sr71]

Ive read a thread here about NZ authorities making a mess of good cars. Handing them over, loosly put back together, with a leftover bag of bolts/fixings.

Regarding shelving. Look at buying some Dexion racking to fit against the rear wall, bolted together, fixed to the floor, and even some welds to the walls. Shelves come in 760mm or 1100ish deep. So two sets fixed together will give you a 1.5- 2.2 raised platform above your car, and less likely to tip over than one shelf.
Also there are 8 1/2 & 9 1/2 feet high containers.
Fridges on their side can end up with broken compressor springs/mounts from rough movement. (Broken compressor mounts on moblie coolrooms are common, simply from rough roads).

I wish you were coming the other way. I'm trying to get a special needs electric wheelchair from Christchurch. Quotes of $1200 for a 750mm x 800mm footprint. You think it would be an easy backload..