Topgun,
"Conventional wisdom says ... "
& since this has never happened here, what's "conventional" about it? Something to consider - nobody has any clue what to expect, or how to deal with it.
All depends on what your SHTF scenaro is.
"Country" is different. We live about 5-8 miles outside of a fairly smallish town, but well with the corridors of I-25. It's not real farmland by any stretch, but does have its goodly smattering of deer/elk/stuff AND pretty nifty ridges that are natural barriers - we grow stuff though. We have a goodly lake 1/4 mile away. We're in a kinda "rural suburbia" - with natural fortifications.
Anything "Y2K-wise," I figured to blow off electricity entirely = we can get by w/o that, go a bit "more countryfied."
There's food that'll stay well 'n good a long, long time.
"The country would probably be the first place marauders would head."
I would do everything (ditch the roads & post rifle sentries (5 max would do it here) I could to prevent the hoards to get here. There's a "but" here though.
"Food ... available for looting ... Extra ammo would be "findable" in city by well planned raids. "
So you'd start looting? & by forming your own gang/s, huh?
I'd suggest a prepared plan of survival by hunkering down & let the cannibals sort it all out first. After that, you & other "more humane" types may want to reestablish some sort of "order" & start the "re-living" process.
Somehow, thinking of armed excursions into others' property doesn't really bode well in my mind as a survivable, or morally justifited, continuance of existance. Maybe "git some" (of yer own first) so you don't "have to?"
SHTF has so many aspects to it that nobody can even conceive them all. Best you can do is have the skill-sets enough, have stuff on-hand, etc. that you have a decent enough chance of weathering the storm.
Going overt is not one of my priorities.
Assuming the "hoards from the cities," I would hope we could prevent them from getting here - just make a sane pocket. Likely, my idiotic neighbors would help pave a road for them. By ditching & "maintaining" two "entrances," we could preserve close to 100+ square miles of prime deer/elk/watershed (3 main lakes w/attendant water-critters). Plenty good enough for who lives here now, but certainly not enough for a 100X weekend warrior-type increase (not to mention their bad habbits).
Even in the "worst scenarios," we've a private plane to go to a much more private area ..... & I don't even care for that neither.
I do go on ....