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Have you completely written a script to gather load average from a remote host using ssh? If so, you could either create a data input source for it within cacti to directly gather the data. Or, if this is slow, have the script write the data to a file where another script could feed that data to cacti every five minutes.
Both methods sound sort of hacked up though. If I were you, I would compile the latest version of net-snmp and use that to gather load average (among other things) from the remote host.
Another option for remote data gathering is to run the data-generating script from inetd on the server and use netcat to grab the data from it, then you can do what you please with it. I have used this a lot with mrtg in the past.