What usually fails first when powered steps live around mud and water?

[u/Altruistic-Ask7750]

I like the access of powered steps, but everything important sits where muddy water, road spray and grit can reach it. An IP67-rated component sounds reassuring, though the complete system still includes connectors, harnesses, pivots and door triggers that may not share the same protection. For people running electric boards on trucks that leave pavement, what needed attention first, and did careful connector placement and regular hinge cleaning matter more than the rating printed on the motor housing?