I'm looking to build a small skid type sprayer for a John Deere gator. I want to use a 50 gallon tank and a electric pump. This would be used only for landscape bed maintenance, ie, spraying liquid pre em and non selective weed control products. I will not be doing any lawn spraying with this unit. What I'm looking for is for some advice on what size of pump, nozzle, etc. Any suggestions? I'm sure somone has built one before.