You know that shed I turned up in on Sun? Perfect dive mobile. It's got self-levelling suspension so you load it up so the towbar scrapes on the floor then drive 20 yds down the road and it pumps itself back up. Plus the car is shagged anyway so you really don't care about dive kit trashing it.
However with all that weight in it does handle like a pissed up tramp on an ice rink.