Reddit reviews Jumbo 7.75" Aluminum Carabiner Snap Hook with Soft Grip

You mean THE WORLD FAMOUS Jumbo 8" Aluminum Carabiner Snap Hook with Soft http://www.amazon.com/Jumbo-Aluminum-Carabiner-Snap-Hook/dp/B003LV3UZM
(On mobile) sorry if link no work

Get a nice giant carabiner and hook everything up.

Maybe use a duffel bag or better yet a tool bag from a hardware store?
Maybe use a big carabiner to bring them all together so they don't mish-mash and tangle with each other?
https://www.amazon.com/Jumbo-Aluminum-Carabiner-Snap-Hook/dp/B003LV3UZM
Maybe use a clothes hanging rod in the trunk up high and just pull what you need at each site off it?
https://www.amazon.com/High-Road-Expandable-Car-Clothes/dp/B001NI7KE2

Yeah, that's more along the line of what I was thinking, but moreso utilizing the hole of the controller. Like, say, using one of those extra large carabiners to just slot into the hole of the controllers.