How can I book/hire one of those carts to get from the arrival gate to the TerminalLink train (to stay airside while connecting (most likely) from B to E?

I fly in next Wednesday (DEC 18) on UA5190 and out on UA0559. If 5190 is on schedule there are about 80 minutes between flights so that's fine. The problem is that UA5190 from YYZ has been delayed for way too long for the few past days. What if I miss the connection? The flights are on the same ticket.

Thank you.