I dunno, they just seem to be in general more drivable / driven than old muscle cars. No problem with that.
Maybe part of it is the fact that in a lot of ways, modern trucks haven't improved a whole lot from them! I mean, look at the basic designs, not much has changed...live rear axle hung either by leaves or coils...the front suspension is nearly identical, except for angles and positioning of parts (i.e. the shock-within-spring of my mom's 1997 Suburban)...standard improvements in the driveline and interior...
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Project 1970 - soon to be seen at
http://milhouse.treylis.org:81/