Traveling to my first camp out in the van I used both the GW USB in my glove box and glove box light location, and the dash volt meeter dual USB Dennis installed.  The GW barely kept up with the iPhone being used for navigation.  It was unable to build much of a charge just maintain. I changed to the other USB and the phone charged right up while in use. 

        Dennis also installed a rear USB and it powered some demanding UsB devices.  So. Very glad I ended up with some good ones. 

If I add more I hope to learn what to look for as they are not created equal.

Also, having USB I’m exploring the useful devices out there that allow for USB recharge rather then old AA batteries.  The flash lights, head lamps, and portable fans are amazing, even an over head light with remote control.  And no running out of batteries just charge as needed.

Eric Caron 
85 GL Auto