Myself, we move the kettle to the full width 8 foot deep front porch if we get caught by heavy rain. Fortunately, our old One-Touch has TWO handles, so my wife & I can pick it up & carry it from back deck to front porch. Try that with a "modern" OTS with a single handle - while it's burning. For that matter, try to move one even when it's cold a block or so to the beach or way into a large public park! The bean counters at Weber should be ashamed!
As to your problem, bob3, can you stand the thought of 2 pipe/conduit straps on one of your deck posts to hold a patio umbrella?