>> I am wondering if the time has come for cruiserheads across the country to establish a standard simplex frequency...
Not a bad idea, really. "Establish" in this context, of course, would mean everyone just getting in the habit of using a particular frequency when they are out, as Alvaro suggests. This would also serve for Cruiserheads to meet up on the trail, not otherwise knowing there were others in the same area.
>> Most people, by gentlemen's agreement, move up in increments of 15 khz for FM simplex...
Primarily to keep the wide, broadbanded FM signals separated. In fact, an older gentleman's agreement dictated a 30 khz separation (seems a bit much to me, though in close proximity 15 khz often is not enough). Common sense dictates your choice here.
>> We have had great success at 146.460...
This is a particularly good choice. Not only does it satisfy the 15 khz separation increment, but the 30 khz as well - for what that's worth. Also, it seems to be ignored by most locals (there are always exceptions, as noted) and not a busy frequency. In fact, I often use this one with locals for 2m > 6m full duplexing, just for the reason it is not often used, and away from the crowd.
Although the "bandplans" (more gentleman's agreements) suggest that repeaters are lower than this in frequency, there are some up this high. When encountered, simply go up 15 khz
>> ... or oddball stuff like packet and Morse down around 144.000.
Not oddball for the many that use these modes

Actually, there is another simplex calling frequency on 144.200 for SSB, and 144.2 up to about 144.5 or 144.6 are all simplex frequencies for SSB (FM not permitted in this portion of the band). Just FYI, because I do not believe that SSB serves much of a useful purpose for the type and kind of trail communication we are considering here.
Another "oddball" thing you'll find down on this end of the band, are CW beacons. Extremely useful for determining propagation, and what kind of range you can expect from where you are located. Unfortunately, the common FM only radios most guys are using cannot hear the beacons.
>> Try a GLASS MOUNTED ham antenna...
I am not fan of these. In major metros where repeaters are easy to hit they work fine. However, the inductive losses thru the glass are quite high and in the woods, might be the difference of making the contact or not.
Anyway, welcome Richard! There are over 40 licensed Cruiser hams on this forum... more than this particular thread would suggest
>> Not sure you would ever physically get caught...
If there is one thing that seems universal among hams, is they do not cut much slack for interlopers. Anyone who does not know the protocol, or is faking a license call sign (or both

) will stick out so bad they wouldn't last the day.
In addition to the other comments about such transgressions, the FCC (don't know about Industry Canada) has a "character" element in the licensing process. In short, if you have a prior FCC conviction, it may well prevent your ability to get a license at all, even if you pass the test. "Even a 10 year-old can do it..." Pretty well sums it up.
Cheers, R -