What I disliked about all the commercial mixers is they are very hard to move. When I mix concrete, I typically get a truckload of gravel and sand
and mix it up myself, but the truck dumps the stuff in the driveway, and the concrete goes somewhere else. Most people dump into a wheelbarrel,
but what I did was make my mixer so I can load the dry ingredients from the driveway, then roll it to the dump location, and then mix it there,
and pour it where it needs to go. I also don't always have 120v power either and extension cords are always a pain, so I made it run off a 12v battery.
A fully charged car battery would run it enough to mix and pour close to a yard.
I made it from a 30 gallon hdpe drum, and powered it using the small "2500lb' HF winch, one I used on my trailer that had a terminal broke, so I fixed it for this project.
The real key was I bought a trashed golf-cart-truck thing for $100 that had big wide wheels, and I used the frame and steel to build the mixer and the front axle and wheels,
so I had really big wheels that easily roll on dirt gravel etc, and have the weight centered, so I can just lift the tonque and roll it around even with 200 lbs inside.
I sold the cart dump bed for $50, so it really only cost me $50, and the drum was $10. I have a picture of it somewhere. First version I used a bike pedal hub for the bearing,
but that didn't work so well after a few yards of work with it, and I replaced that bearing with a car front wheel/hub bearing that I had, which was overkill and no problem since.
The other updated was concrete tends to stick into the corners of the back of the drum, so I added some wood and fiberglassed in to make the back rounded, big improvement.
I decided I needed a bigger one, so i also built one that is very large, can hold 1/2 yard, but winch motor isn't strong enough to spin it, so mostly do 1/4 yard,
that one was made from surplus junk too, but I did update with an industrial gear reduction unit that was like $150 I think. That one can't be rolled around with a load in it.

But both have trailer hitches on them, so they can be towed.
Here found a pic, you can see both, the big one, and the little one.
