12volt outlets

When I get a Rocket(which is not far away 8) ) I want to add some 12v outlets for various things like a low watt fluoro light and possibly a very small compressor fridge if I get a trailer.
Anyone done this?
Also what is the alternator output and the standard battery size?

See here

See here.

http://www.r3owners.com/viewtopic.php?t ... light=fuse