How I made six galvanized trough planters that have held up for years

[Update April 2019]: Just about to start our third season, and these planters are holding up really well!  The wheels still roll smoothly, and no rust so far. Want to make cool galvanized trough planters?  So did I!  Here’s how I did it. Why galvanized trough planters? Lots of reasons. We live in an old [...]