Lose the stock jumper hose and replumb with 3/4 or 1" line to the tank. This is the reel I bought:
Even if "typical flow" is 7+ gpm, I would still run a small buffer tank. It's insurance for when the customer decides to run the laundry or take a shower, or the automatic sprinklers turn on.
The buffer tank will also keep your pump running cool when it's in bypass, as long as you run the bypass line back to the tank.
I would say 35 gallons would be a good size for "just in case". 55-65 would be better if you think you may be working off of wells at all in the future.