Instead of rent a cart to make carting your multiple roll bags easier, what about rent a ruck? Instead of getting off a plane and finding the first place you can to sit some more, and getting more tired from being tired, take it up a notch and rent a ruck and a plate and get after it while you’re in the airport?
I think there is basically zero market for this, people, but the alternative is my go-to, which is that I don’t travel with a roll bag, only what I have on my back. When I get to my layover airport, I ruck around, usually doing lap after lap and feeling a bit like a madman passing the same people scrolling on the same tired ol’ screen. You can get thousands of steps in the ruck the airport way, more with a longer layover, and if the pace of humanity is not for you, as it’s not for me, then ditch the cart pool and the roll bag and get strong in airports the world over.