Here's the Optima Blue-Top that powers my campsite electrical needs. Wife says no RVs take your tent so...The unit has 10A+ and 20A- fusing on both ends of 2 seperate power circuits. Battery charger-type quick disconnects finish off the connectors, which have heat shrink over crimp connectors. Crimp connectors assure easy field repairs vs. soldering. You can see two Wagan 3-into-1 plugs in use here with a digital voltmeter. Note the if-needed 180W inverter. Not shown is a Radio Shack stepdown adapter 12V - 5.5, 6, 9 and 12V.
http://i206.photobucket.com/albums/bb296/firetender69/2009-06PARTY011-2.jpg
http://i206.photobucket.com/albums/bb296/firetender69/2009-06PARTY013-2.jpg
http://i206.photobucket.com/albums/bb296/firetender69/2009-06PARTY017-2.jpg
The system here powers the Kenwood/Polk music system shown on another thread, as well as up to 3 18" CityLites programmable LED light bars, a portable flashing unit, and a 16-lamp folding LED desklight. Wiht the converters handy there are a lot of devices that can be powered or charged up on the spot. There are 5 open plugs available at once since the digital voltmeter is kept connected in one socket...