OK, here's a "winter" question:
Let's assume you have a beach with hard to medium soft sand, and a big wheeled trolley (Cat Trax etc). Does your trolley roll best with the tyres (tires) inflated hard or soft? Hard is good for a hard surfaces, but does 'soft' roll better on soft sand by spreading the load?

Come on, at least it's a bit better than 'test'!