Quote:
Originally Posted by MrGitrdone41
Xtrememotorworks has them. If u want to make some get 12inch all thread that how i made mine i have no spacer but is ok not to use them all the pressure is on the inside tire. You need 5/8 all thread and nuts dirt cheap too! 
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The all-thread will eventually wreck the square wheel weight holes in the rims. If 'all the pressure is on the inside tire' then there is no advantage to the duals. If the second tire is touching the ground, it's doing something, and without a proper spacer to carry the torque, you run the risk of messing up your wheels with the all-thread.
Donny-
Here's what you need.