Almost every local track has a series that use the Ford 9" type rear. The truck arms, not so much... mostly three link, four link, snubber, five spring, and alterations of those are common on the local short tracks.
I said that there has not been enough experience, not enough racing, for me to judge the NextGen in totality. My only concern is whether or not it will drive a wedge between the traditionalists along with alienating the grass root fans that also follow local bull rings and regional "stock" cars.
As I have stated in the past, many times, that I think that we have gotten way too aero dependent, which makes the skill of the wheel coupled with the egg between the foot feed and the sole of a shoe less important.
Do not have a problem with the bodies (other than the aero enhancements) so far.