Simply using the wheelbase/length ratio to "determine" the likely handling characteristics is bogus. That is but one measure, and much more important is how the rig is designed and loaded; weight behind/in front of rear axle, sway bars/track bars, tire pressures...
My class A has a ratio of just 51%. According to CR, that means that it is "difficult handling under normal driving conditions / very dangerous under adverse driving conditions". Hmmm...non of that description applies; with the correct tire pressure, it is one of the best handling RV's I've owned/driven (3 RVs over the past 30 years).
On the other hand, my last RV, a class C, had a ratio of 54%. According to CR, that means that it would be better, but "tend to wander and cause some driver fatigue in windy conditions, when trucks are passing, or on uneven roads". In reality, that rig was a major handfull under even the best conditions.
