Pondering ideas of my next project. The ballast box is patiently waiting in my shop.

I like the idea of a Click~N~Go ballast box. For weight that can be added/removed from the box, this way is convenient.
Having the weight closer to the rear wheels (no FEL) also keeps OAL as short as possible.
Estimated weight planned is going to be 275lbs. That's about 3 bags of Portland Cement plus a smidgen.
Rated weight of the 3PH = 450lbs. I'm pondering beefing up the ballast box to accommodate maximum capacity.
I also plan to attach castor wheels that can be removed after mounting. Given that, having it mounted to the 3PH would be a plus.