Such great information from everyone.
Awesome.
I think that we may have a winner with the lightning fast wear with underinflation idea.
I routinely take my pressure down to 15 psi or sometimes less when I'm stuck....I should take pictures.....Then I drive 10km of pavement to fill them back up. It sounds like this action makes this wear plausible if not likely.

- Bosc's Deli
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I'm terrified of spending $1000 on new tires to have it happen again.
I don't like these tires anyway, just had a good deal on them (everything for exactly $500 tax inc.)
Almost all of my use for my deli is on the beach, so on sand, which requires more floatation than these wee 27x9.5 r15 tires can give.

- North Beach Haida Gwaii
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I would love to buy 4 new tires that fit with a width of more like 11.5. I may need a lift and likely new rims too.
Does anyone know how big (31 i think) and especially wide you can go on a stock deli?
Any tire suggestions are very helpful as i have to order them in since there is no tire shop here.
Can't let the toyotas have all the fun...

- East Beach Haida Gwaii
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Thanks Again everyone.