I recently acquired a similar setup ( Rigid Pro Tool Cart & Pro Organizer ) as those two stacked together will just slide in the back of the truck, under the cover. I use the base to store my front rest, rear bags, spotting scope & mount, targets, cartridge capture net, ear protection, & small tool sets. The upper one has room for a 2-3 handguns & ammo. I mainly use that setup for the local indoor range so I can take along a couple cased rifles on one shoulder then pull the portable cart with the other hand. I also use the setup as a seat as the chairs they have at the indoor range are too low for a good shooting position when shooting off the bench. I’m on the lookout for a cushion as it gets a bit uncomfortable for longer range sessions. I used to attempt to carry some of that equipment in a larger range bag, but it was heavy and hard to maneuver through the double doors.
It would certainly work for my outdoor range as well as most of the same equipment is used there. One can always unload everything and use it as a portable tool transport as it was intended.
BTW - I’m kind of fond of CZ pistols as well . . . I have a 75 D Compact , 75 SP-01 Tactical, & a 97 D (all with Cajun Gun Works kits ), but the favorite shooter is the 75 Shadow Tac II.