In theory having the appropriate amount of loading on the front tires is a requirement for proper handling.
However, Winnebago has apparently compensated for the lower loading on the front axle in the Aspect/Cambria Motorhomes. Often we had much less than optimum loading on the front axle and on our 9000 mile trip through many types of terrain and weather pulling a small trailer and it handled very comfortably. It drove much better than our 23ft class C which had a higher front axle load.
Not sure how they have it set up, but on the two Aspect motorhomes we have driven, the handling as been very crisp, clean, and comfortable. Its fun to drive.
Now, if we were to try pulling a toad like Vach is doing.....that might be a completely different story. Will be interested to hear if there is a solution to the tail wagging the dog problem they are having. We may have to stick with trailering a scooter as a toad.