I have a variety of setups but find the one I use most for this type of work is a cheapo 15 gallon with a hand held wand. I put it in the front wire rack of my Rancher. I use an old deep cycle battery for the power source thats strapped on the back rack.
I like it because its easy to lift on and off, and strap down. It washes out easy. 15 gallons is usually plenty for what I want to do at one time. I usually only mix 10 gallons. Thats quite a bit for spot spraying. The small amount lets me change chemicals often and keeps the mixture fresh. My kill all mix of chemicals is 40% Sendero, 40% surmount, 20% Remedy. The proper amount of surfactant is used. My main targets are mesquite, cedar elms, green briar and honey locusts but it will kill most everyhting weed or brush wise. The chemicals are about 2 to 3% of the mixture. If I was to use only one, Remedy is hard to beat.
Another thing I do is I catch all the remaining mix out of my big 300 gallon sprayer before I clean it out. This is usually 3 or 4 gallons of a Dicamba 2 4 d mix. I add this in the 15 gallon sprayer mix when I have some.
You can buy these small sprayers for about $65 at Atwoods. Buy an extra wand or two to have on hand. I tend to run over one or two a year.
