I removed the side panels from the cargo area on my XJ. You would not believe how much stuff that you can cram in those caverns.
The left side is a little tighter due to the gas fill neck but there is a climbing rope, a quart of oil, rags and who knows what else in this side.
As big as it is a retractable reel may be too much unless your going to service a lot of stuff. I'm thinking you are because 85% that have on board air claim no need for a grinder but as you probably know if I could have one power tool it would be a grinder.
My cord is in a bag. Almost all women buy dipity doo and make-up in fancy marketing cases. Ya know buy the expensive shampoo and conditioner and get the peach scented hand cream all in a nice bag. Snag those bags or buy them up at a Goodwill store. You should see the pink bag my Allen wrenches are in or the flower covered bag all my chemicals like epoxy and RTV are stored in. Saving space and cramping it all in is such a problem this forum even has a dedicated section on it. I zip tie parts and fluids under the hood as well. You learn to do that with a wife, two kids a dog and cooler. Good luck with your cord.