Here is the baseline info: 190 x 210 piece of property. 60 PSI with 35 GPM off a 1.5 horse. Looking to run 1.5 PVC pipe out of the house thru the backflow out to a truck line with 6 zones valves attached again 1.5 RB's. From there should I stay with the 1.5 PVC pipe or 1 PVC pipe or even 1 polypipe which we normal run. Only asking due to the pressure and GPM. Thought the 1.5 PVC would be best with swing joints for the heads. We normally run poly pipe but something keeps telling me 18 GPM max for 1 inch poly. Going to run 10-12 rotor heads per zone spacing looks good. This is my first big install like this but the only thing that changes from a normal install is the presure and GPM so everything should be the same. Will be the first on the trencher though!!!!! Would anybody use a bigger main truck? Would you use polypipe after the valve? And what size? Thanks for the help!!!!