Is the idea that you want to buy multiple hump packs and swap them out easily?
If not then just do a search through the board, theres a ton of info on how to mod the connectors so that you dont even have to take the battery out of the truck to charge them.
Keeping thing IN the battery / radio box is a good idea for a couple reasons. Keeps the center of gravity low, keeps as much wiring as possible out of harms way, keeps things dry if you seal your box, keeps yuor electrs from getting a crudded up with dirt and dust and al kinds of other stuff electronics dont like.
Keep it in the box.