On my solo trip to Pop Century in September, I specifically asked for ground floor, king bed, 50s section. When I got to check-in, I had been assigned ground floor, 2 double beds, 50s section. I explained that with my ECV, a king bed was rather quite preferable, as it would give me tad bit more room to get the ECV in for the night to park it, and then back out the next morning. She made a phone call, then went into their back office for a moment, and came back with approval to move me to a room that was ground floor, king bed, 50s section. It was perfect, and totally worth the wait.
On prior trips as part of a couple, at both ASMu and AKL, we were able to get the check-in CM to move us to a king bed room, also.
I never expect it, but I do ask. Can't hurt, right?
On my upcoming trip, I'm booked in a Garden View at POFQ, as I didn't want to spring for the King Bed room. I've requested a corner though, so fingers crossed!