This group tends to be in the same IQ range as the 'Second Sigma'---i.e., between around 115 to 130---but generally tends to be stronger in mathematics and spatial relationships (especially) than verbal IQ. They very frequently work as techs, contractors, or highly skilled trades. An associates degree is the most common level of education for them, followed by a high school diploma. There appears to be a strong thread of independence in this group---one friend of mine who fits into this category tells me he has NEVER had anyone who he called 'boss', just customer. They tend to know a LOT of useful skills, often including things like flying helicopters and airplanes.
I honestly see a lot more actual intellectual curiousity from them than I see from the Second Sigma types. They almost always have a fair set of real interests where they have read a lot and where applicable, actually practiced. They tend to often be interested in meaningful discourse with you, but only if you can demonstrate that what you're talking about can be used to make good predictions or actual useful products. They've got little use for
Politically, most of them are what I call 'Low Church Libertarians'. I don't mean Low Church as an insult---frankly I like Low Church Libertarians much better than the High Church version anyway.
A low church libertarian has a general presumption that they want to be left alone inasmuch as is feasible. They also have no particular desire to rule over other people and do so only grudgingly when Reality requires it. They're not in love with philosophical abstractions like a 'nonaggression principle', and they tend to be nationalistic (another thing I like about them). Live and let live, 'it's a free country', and 'leave us alone' are their most frequently articulated slogans. They tend fairly conservative in their tribal affiliations, although much more paleo than neo---but again, they're unlikely to use such terms.
I tend to use this group as my benchmark for judging whether a social science has any merit to it. Can said school or group within the social sciences make better predictions than a Smart Redneck? If not, how much value does it have, other than perhaps the attempt to force a willfully delusional society to face reality.
This group isn't huge---maybe 5% or so of the population---but they provide an awful lot of what makes our standard of living so high in the US. Readers would be advised to cultivate at least some contacts within it.