I did some searches and found a couple that people thought the stock rear quarters were made of 18 guage. Is this correct does anyone know? 
Thanks

Thanks
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Most aftermarket suppliers use 16 guage.
That is unless you are Tyke Moses (Poor Wally's Landcruiser Emporium) and enjoy building tubs with 1/4 inch sheet or 3/16ths. I think Budbuilt has something similar as well.
Didn't realize it was that early!
So JohnnyC, how much does your Cruiser weigh?![]()