I seem to recall that there was such things.. are there any RIFTS books that you'd say had some good relatively generic Random Encounter Tables? By "generic" I mean not tied to a particular event in the RIFTS setting (ie. the coalition-tolkeen war, or the mechanoids, or something along those lines).
RPGPundit
The RIFTS GM screen had random encounter tables, several IIRC, but I can't recall the specifics of the different tables (it's been a long time since I've played RIFTS). I seem to recall there being pretty generic tables on it though.
Unfortunately, it only has two: one for "random coalition patrols" (which only detail the patrol type names, you have to look up what each patrol would actually consist of over in Sourcebook 1), and one for "animal encounters" where you can run into 1d4 Bears.
Not what I was hoping for.
RPGPundit
http://www.telluri.com/lin/palladium/leylines.html
About 3/4 of the way down.
I made my own a long time ago, (probably long gone, but I'll check my notebooks) and I used the ones in Monsters and Animals (Paladium Fantasy) as well.
Well, um, that's an interesting page, but again that seems to be more of a "what comes out of a Rift" table than a generic (north american) wilderness encounter table.
RPGPundit