If you have any product recommendations for sleeping bags that would be great.
I would put the tent, sleeping bags etc, the bulky light items which you only access once a day setting up camp into a small thule on the roof or roll bar if the top is off. It could be detachable. Setup a kitchen across the back, accessible thru the tailgate, and a divider, shelving setup for clothing etc accessible thru the rear doors, by folding the rear seats down. Find an exterior mount for the shovel etc. White gas is way more compact than propane.... burns better at higher elevations too. Water, multiple smaller containers. 2L pop bottles are an excellent choice. And just carry drinking water. If you are going to boil it get it from a tap.... even a stream. I'd store the water in something fitted inside the rear triangle of the roll bar. Maybe a fabric bag or build a box? Cargo seat covers for toiletries, wipes, first aid, gloves, toques.... water bottles, books....
Look at all the built in cargo bag gear. ie Smittybilt.
Tools, spare parts, recovery gear?
What do you really need?
If you have a winch all you need is a tree saver strap.
Parts? It is a brand new JL. Get AAA & use VISA. There is no excuse if you break something.
Tools? All you should need are the tools which came with the Jeep. Maybe a few basic things to adjust any storage systems you add or to fix some camping gear. But a brand new JL..... nothing should need fixing with responsible family based wheeling.
Lots of my comments are generic, not necessarily aimed at your questions.