EFI provided the reliability folks needed to make the long drives West. 75-80MPH Interstate's save folks 1/2-1.5 days of travel round trip. Throw in a bit of TV and YouTube encouragement and it gets BUSY in a hurry.
The other aspect, "The Hunting Party". You don't see folks who grew up in the West hunting with 2-4 truckloads of their friends. Mostly it's alone, immediate family, or 1 maybe 2 good friends. The 10-20 person cabin/camp thing is still alive and well E of the Mississippi and now at least parts of those camps travel annually. Lets face it, it's a whole lot less expensive to split gas 4 ways even if you have to pull a trailer.
