a googled example

Here are the wheels that she bought.

I've got a '69 F250 CS. It's not lifted and I'm pretty sure I don't want to lift it. It's more of a work-horse, drive around, all purpose truck and something I can go camping in and if I happen to sacrifice some rubber to the tire gods so be it. It won't be a 4x4 mudding or anything similar truck.
so while they are roughly the style I want, I think the 12.5 will mean I'll have to run swamper style tires, which I don't want to do. I think the size of the tire I want is roughly a 265 or 275... Does this mean the 12.5 wheel is WAAAAY too wide to run a tire like that ? I've looked at Summit and Jegs and the only tires left they have with a 16.5 wheel are swampers.
Anyone have a better idea of what I'm up against trying to use these wheels. If I have to sell and get a set of 16's then it is what it is, but if I can use them