Here is something I am toying with. This build will probably take a while as I do not have much or any parts at this point to build it.
Thinking of building a yard sprayer with an old hot water tank and a Murray Widebody frame.
At this point I need the plumbing. I have a pump but don't think it would be powerful enough for a larger boom. Hoping for a 6ft wide path and maybe a wand?
On my sprayer I have been thinking about putting the battery right at the tongue so I can hook up to the LT battery with a trailer 4 way flat to provide power to at least trickle charge the sprayer battery while I am using the wand. 2 way flat might work, but, I figured one to frame ground, one to (+) and one to (-).
My plan is to water potted plants father away from the house then 150 feet of water hose. Though I do have a bulky 12v pump for major water moving, to get the water into the tank I will try either gravity from my 330 gallon water tote or a Ryobi 18V water pump.
I am going to try small flat free tires and see if they flat spot with 200# of water and a trailer on them. Mine has to be 2 wheeled so I can easily back up and make tight turns.