I'm collecting some information for a pet project. Any feedback on what hopper you alike and why would be greatly appreciated. I'm designing and building the ultimate compact applicator designed to compete with the smaller units on the market (ie not the larger Z-Spray machines). The applicator will have a very unique drive system (frame and chassis) with capabilities not seen before. We have been working on the drive system for quite some time. It's very, very nice. The frame is scale-able (small and large models coming). This first one will be small, compact, and able to side load into a van (my black Metris) or rackable. The 2nd model will be larger (48" wide) and compete with the larger Z-Spray Max machines. I'm looking for input on what you want for the application side of the machine on a compact applicator. The drive is already completed and you won't be disappointed I guarantee it! Feel free to post on spray tank size for a smaller unit, if tank agitation is important, nurse tank option for 2nd chemical, single speed vs variable speed impeller, hopper size.