This has come a few times in the past, someone else put me on to one of these:
I recommend a Vority Dual USB car charger from Amazon. 3.1A and 1A outlets.
It will charge my mini iPad and iphone together
and most importantly, NO radio interference on the MGL v6 when charging.
Oooh bugger - currently unavailable
Amazon.com: Vority Dual USB Car Charger 3.1Amp 15.5W (White) 1.0+2.1A Universal Ports, Smart Power Supply For iPad Mini /4/3/2, iPhone 5S/5C/5/4S/4/3, Android / Blackberry / Windows Cell Phones & Tablets, Portable Cigarette Lighter Adaptor, Mobile Travel Charging Station 12V Input - 5V Output. Fast & Smart Duo31CC: Cell Phones & Accessories