I have outgrown and mower mounted tank sprayer and looking to transition to a skid mounted sprayer. I am looking into a 100 to 150 gallon unit. Due to weight and space restrictions. Two manufactures I have in mind are Reddick Equipment which is local to me and GNC Industries. I have a few questions im trying to get cleared up before I purchase one. 1. Roller ,Piston or Diapram Pump? I have used roller pumps in the past and they seam to be more reliable. 2. Hose Size 3/8 or 1/2? Im looking at running a 150 ft reel with 150 spare hose in the bed. Is there a big flow/pressure difference between the two?