I have big and little air tires on my swap meet wagon, nice **** rake. It pulls real nice and doesn't rattle. They do stick out a little and catch on stuff though. It was just a cheap Mal-Wart radio flyer. I had been wanting to do a cool lowrider from an old pan like you did. I have a good pan but haven't got around to it. I want to use 12 and 16 inch bicycle tires.
Then I got the pan I really wanted, a 50s Murray with the heavy roll and rounded front. But alas it is a nice complete wagon, even has all 4 hubcaps and I can't bring myself to ratrod it.