Do you sell a pre-built kit for adding auxiliary 'hotel' power to my 4Runner?

We don't have a pre-packaged kit for this — electrical upgrades like this are usually custom-ordered around the vehicle and your needs. We do offer a Genesis dual-battery kit that uses a group 25 battery of your choice and mounts under the hood, so it doesn't take up interior space. Stop in or send details and we can quote an installation.