The biggest problem with the single in my opinion is that it will be longer and you'll have to step further back while it opens. It may not sound like much but it is a major annoyance if you have to do it all the time. Experienced it with my dad's minivan.

Anyone seen the Lexus LX SUV? That huge rear door swings open sideways... that has got to be aggravating opening that thing every time.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr