They did on our '06 Cedar Creek! Didn't have the 6pt, but knew another couple that had a CC w/ 6pt and they said it def helped as well. Now we have a '18 BC 3560SS w/ 6pt and it was wiggle to it, but ok. I think what we as RVer's are finding out (hence your question) is that many have the 6pt and IMO, I think the the reason we feel a lot of wiggle is due to the rearward most legs are right behind the rear axle, thus LOT more feet behind them to rear of coach which creates the EXTRA wiggle. If either the rear legs OR an add'l set of legs were further back, that would reduce things a lot. Hmmmmmmmm, a RV w/ 8pt level up???