I had an old "Ride and Beautify" tow behind sprayer that served me well. Now I am looking for a replacement (can't find parts). The sprayer put out nice droplets (very little drifting) and pumped using the wheels thus changing flow with ground speed and therefore was always the right metering once the mix was figured out. Simple and reliable with few moving parts. Is there anthing around that replaces this? Can the 12 vdc sprayers put out droplets to reduce misting drift? How do you compensate for ground speed changes?