I don't think it's about a "westerly bias", I think it's more practical than that: There just isn't that much public land East of the Mississippi that's explorable by off-road vehicle. You are either traveling on paved or well graded dirt roads that any vehicle can traverse, or you're on foot - there's very little "in between" area that is accessible by a 4x4 but not by an ordinary car.
Originally Posted by Bushmaster6
There's also the issue of crowds and cities - we have less of both out West. Since many of us go "overlanding" to get away from cities and crowds, we're naturally drawn to the West.
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I'm a million miles before you, I'm a million miles behind
I'll take you straight and narrow, I'll ramble and I'll wind
So curse my broken brimstone, or kiss my bricks of gold
I'm not the reason - I'm just the road
- Aaron Watson, "The Road"