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    West Central IA | I have both a 4430 and a 4320 I use on carts.  Anything under 500 bu you will be fine.  I prefer to dual up though.  I use a brent 420, Unverferth 5000 and sometimes a EZtrail 510.  Haven't used a support on one, but I don't load them heavy in the front either.  Nice thing about more carts is if it is crappy in the field you can still have a semi load without overloading one and getting stuck. |  |
 
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