Long wheelbase 7020

There was a good sized construction company here in California build 1000's of miles of highway.  They became the go to for concrete paving for a time. But after a few years all the expansion joints became high spots. Some vehicles rode much, much better than other many times just to due with the wheel base. Many a independent trucker specked trucks the with the wheel base that gave less bucking rolling over the expansion joints. I was told just 2 inches more or less made a huge difference. The state spend a fortition  planning the concrete for years. Finally in the last 20 years all has been replaced with asphalt concrete.