Get a used leaf blower, 5hp would be good, 8 even better. And with a
*steel* fan/impeller, some are plastic. Check the yellow pages for
"hoses" and buy the 6" vacuum hose. I paid about $7 a foot and well
worth it. I use mine hand-held (not from a mower deck) and the biggest
problem is sticks creating clogs in the hose. With the mower breaking
them up it shouldn't be a problem. Once they get down the hose, the vac
impeller minces them nicely.

HTH,
Bob