I tried to overcome the flat tire situation by using the run-flat tires, available from princess auto etc on some shop carts I have here at the museum. The problem is that if you leave a load on them, they develop flatspots for the first while when you go to move them. But on the plus side, they are truly worth the extra $$ as opposed to dealing with the constant flats you get on the Chinese tires these days.
Another option if you have the room, is to grab a bunch of the smaller hide-a spares from your local junkyard. They are cheap, you can buy the appropriate (knock-off) hubs sealed for life for around $30, and are of good quality. They are perfect for oxy-acetylene carts as you can then go cross country, over airlines and extension cords without impediment.
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