I do all my blowouts myself. Maybe blow out 200-300 per year. I like the compressor in the pickup. Majority of blowout connections are boiler drains which don't have a large opening anyway so methinks a large hose is not necessary as far as restriction.
I know that the big tow behinds are quicker but I do not want to lug any 1" hose around or reel it up. I have an air powered reel that reels up 200' of 3/8" hose in no time at all. And I am not totally wore out after a day of blowouts.
My two cents worth. I can pop two zones at a time now but the compressor will not keep up to efficiently blow both out. Hence, my desire to try a somewhat larger compressor. And the original question as to CFM capacity of various hose sizes.
Thanks for the input.