I find the opposite to bob, I use to run 2 pumps for 2 hoses and reels, now i just use one pump, mind you I do have 3 set up in case of breakdowns, which happened last week, one of the pumps is only working at half power.
if one breaksdown a quick swap of the inlet and outlet hoses and I am running again, they are all wired up to the same power source.