The pg_autovacuum said the best way to use it is running it from SysV initscript, but unfortunnally the works has not been made.
I made it for mandrakelinux inclusion and should work on Redhat too. Feel free to adapt to your need, work fine on my configuration. See attachment. And keep the good work.
pg_autovaccum
Description: application/shellscript
pgpmD1Zx9TVNZ.pgp
Description: PGP signature
