Look at Costal tech. Their front camera comes on automatically when your under 8 mph for those very things... if you get the front camera mounted.Might I suggest a camera on the front? That's my plan, then I can stop miscalculating and parking 6ft from the curb. ha!.... no scratches yet though and I have 2400 miles on her in 2.5 weeks.
It's not cheap though.