There have been a lot of threads and posts about ballast boxes etc....
Here is my version.
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I have about $10 of on hand material into it.
I only bought/needed 6 suitcase weights, as my tractor front bracket only holds 5 weights....
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Darn computer ate my first reply...
Cheapest weights I could find plus free shipping was Home Depot in this area.....
You can find weights on E-bay and such places, but many times they bid up to or over new price. Be careful.
Good luck