I have a Rollator I bought way back in 2008 so I could endure the long walk from the Jackson St. CTA stop and security lines at Grant Park in order to see Obama's victory speech live; and then have someplace to sit if I got tired. I left my house and halfway down the block, en route to my neighborhood CTA stop, I decided the handles weren't tall enough. Adjusting them meant unscrewing several knobs. I resumed my nice and easy walk, went through the gate rather than turnstile, and spurned the escalator for the elevator. Just as I got off the elevator, my train arrived and I tilted the Rollator back so I could steer it over "the gap" (as Londoners say). To my horror, one of the front legs (with wheel) clattered to the floor of the train car. Embarrassed, I stashed it in the compartment of the folding seat after I sat down. At my destination, I found that even though asymmetrical, 3 wheels were supportive and smooth enough for walking and the endless security lines. But once inside when I got tired and tried to sit in the middle of the field, I had to awkwardly plant my weight on one of my legs. Suddenly a security person saw me and whisked me to the wheelchair platform, where I could hook my arm around a rail and sit securely.
Once back home, we found a carriage bolt & nut to secure the wayward wheeled leg, and though it didn't match the other 3 legs' plastic knobs, it holds securely. I am not above putting it in my car trunk if I know I will be stuck with lawn seats at a concert (or if in the disabled seating section, might face a scarcity of resin chairs). But the one thing I'm still too proud to do is ask to use one of the motorized "scooter" shopping carts at Costco or Target. The regular carts make great walkers.