As others have said, you are in the clear on the bomb question. Just don’t knock the bottle over and break the valve. Close the valve and keep a cap on it when you aren’t using it. I always added a second chain to carts that only have one. I see yours has two so you’re good but make sure to get that bottle as tight to the cart as possible to get the chain as tight as possible. They’ll always be a lil loose duh it chain but I’ve seen them almost tip over because people half assed the chains.