I've had a good search and it's down to vans, notably the Sherpa (now LDV) Post Office van of yore or equivalent Transits etc.
The 1007's electric sliding doors proved hopeless when parked on inclines as the doors wouldn't close "uphill" or open "downhill". Manual sliding front doors were, sadly, never developed, unlike gullwing doors, which seem to be making a comeback, and the odd drop-down one (BMW Z1), or even this utterly wacky down-and-under one on the prototype Lincoln Mk VIII which, predictably, never took off: tinyurl.com/68ronw8
Hope that helps!
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