I just recently ordered a new ballast box through my local dealer after a hairy moment moving some timber. I have looked at a lot of post and was curious to get others thoughts. What is the optimal filler for a ballast box? I have seen some that fill with sand, gravel or dirt and others with concrete. I have some reservation about using concrete just from the fact that it is permanent. My thought is to put a plug in the bottom of the box from the outside so that I can easily empty the box after filled and wash it out and allow to drain. I have thoughts of possible using the ballast box as a carry all as well when not needed for ballast. This idea was prompted by those that have welded tubing inside the box for lawn tools and such. My thought is to fabricate a rig for my chain saw and edger on the outside of the box. Any and all thoughts are much appreciated!