Having changed from a MH to a caravan last year have found the caravan easier to level and thus far have not required any levellers under the caravan wheels.
Our caravan, a Sterling Continental 570, has a circular spirit level affixed in the front that you can see as you stand to operate the winding part of the jockey wheel. We use the motor mover to position the caravan on the pitch which seems to make life easier, particularly to align the AlKo wheel lock
In the MH days used 2 spirit levels, 1 on the counter top amidships, the other on the dashboard and manoeuvre using Fiamma ramps if required. Thinking back, what a faff about. So much easier with a caravan.
We carry the Fiamma ramps just in case, but so far not required them.
We do use a set of steady pads on each steady leg regardless of pitch base be it hard standing, mud or grass. Probably more to do with stopping the legs burying in muck than anything else. Also use a battery drill with a winding attachment, set to 12 of 15 on the torque setting. Whizz each steady down till the drill clicks. As the days go on, if there is settlement, which is noticed by the caravan floor becoming 'bouncy', a quick flick of the battery drill soon sorts things out.
Understand the steadies are just that, not jacking legs as in the days of yore when dad had a caravan that was made of solid iron and could be lifted off its wheels by the jacking legs. Often a clue in the name of things as to their application.
Reading reviews of prospective sites and looking at images gives a good idea of site conditions you will encounter.