New to Irrigation Business & I have a couple questions: 1) How much do i adjust an estimate for a Shale type ground that has to be hand dug, as opposed to pulling pipe? 2) After doing a saearch on Nelson products it seems its a Ford vs. Chevy type comparison of quality. Are there definate advantages / disadvantages to this brand? 3) I searched for how "heat" affects an interior controller. I came up empty handed, but noticed this discussion in a few other threads. Can someone expound on this?