I also process while I boil. My sap storage tanks are on one side of a driveway, the RO and head tank on the other side. All season, I have a 1.5" line across the driveway. The sap is gravity/RO feed pump pulled to the RO in the sugarhouse, then the RO pushes the concentrate to the head tank, on an elevated platform attached to the north wall of the sugarhouse. That head tank is tight against the sugarhouse wall, the valve for the head tank is a few inches inside the sugarhouse. From there I have a site gauge for head tank concentrate level, then a T and hose going back to the RO for when I recirculate to remove more water, then from that T the evaporator feed line goes to the pre-heater in the hood, and then to the float box. I also have a bypass line, which skips the pre-heater.
Your RO can push the concentrate easily, as long as the concentrate hose is properly sized. Boiling at the same time as the RO is running is far better, concentrate degrades fast, plus doing both operation at the same time gets you done sooner, giving you more time to check for and fix leaks. If you do pump across the driveway, be sure to prevent traffic from driving over it.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.