Installing trickle charger in '06 GranSport

I know the battery is behind a right side panel in the trunk, and I've used the clamps to temporarily attach a trickle charger to the battery terminals. And when I do this, I need to leave the trunk slightly open (so the wires don't dent the rubber gasket / seal).

However, I'm looking for a more long term solution. In the show rooms I've seen trickle charger leads going into the pasenger compartment (right front seat area?). They just leave the window down a bit so the wire feeds through with the door completely shut.

In addition to the clamps, my charger came with a set of eyelet wires for a more permanent installation (with a type of quick release wire harness). My question is where would you connect these positive and negative eyelets to?

Thanks,

Don