I had two previous cars that were ideal for diving - a Nissan Pathfinder which was the best all rounder, but sadly very much a rarity nowadays. I did look for a new one but they stopped making them a few years back and it's Navara or nothing now
THen I had two Volvo V60's on the bounce. They were good however, being a tall bastard and long in body means that the flat boot isn't much use - I need it a bit higher still. Also, the rubber seals around the boot lid weren't particularly robust and I tended to remove most of the bottom seal after a few diving sessions.
I've given up on kitting up using the boot - now I've a Skoda Octavia Saloon, with one of those portable work platforms (like here) which I lift the twinset out of the boot and onto.
Interestingly, the boot liner from the Volvo fits in the Skoda with room to spare, and the boot in the skoda is so much bigger there's a 4 to 6 inch gap around the edge of it with the boot liner just sitting in the middle! (I'd have put money on the volvo boot being bigger but the skoda is nearly 100 litres larger and it's not an estate!)