I got this from the Snap On truck. It will jump start 10 V-8 motors on a charge. It will also charge usb stuff like your phone, mp3 player ect. I used the front of my Jeep for size perspective.Fits in the glove compartment. The jump starter itself is the size of a pack of cigarettes. It also has a bright flashlight that flashes SOS or on solid. On the side is a state of charge indicator.
Park too long with the stereo playing, no problem.
They also have lithium batteries for SXS's.
http://antigravitybatteries.com/microstart/
This saves me tons of fuel in the toyhauler tank. One gallon runs it over 8 hours. It will run everything in the hauler except the A/C
The Onan 5500 uses about a half gallon + per hour.
Quiet as a mouse too. My kids ride so much, fuel is always a concern.
587 hours and absolutely trouble free...
Honda's are really good too.
What else can make camp life better?