Flush Mount Power Outlet
I found a flush version of a battery tender style plug, and thought it looked a bit cleaner than the standard version of the wire hanging down. I pulled a small trim piece from beneath the seat and drilled and installed the plug there. Pretty simple install. I originally wired it directly (through a fuse) to the battery terminals, but later added it to my full Auxiliary Electronic Control Module. I bought the flush plug (as well as a few other electrical goodies) from an RV parts store online here.