http://www.amazon.com/dp/B00CZ75VHS
I got us one of these, it has so many uses and so handy , it's been on four trips now and used around the house also,(lawnmowers) have had about two months now and today it's charge was down to 61% time for it's first charge.
it is real easy to gauge tires up, the power for grandkids cd player,built in light,digitial read out on % of charge, usb outlet,2 12 volt outlets, 2 110 outlets, inflator/deflator for rafts and such .Also a jump box if you need , and no cord for charging, just plug a 110 cord into the back.