Unless you are cleaning really high stuff all you need in the van is 22-25-35ft poles,the choice is yours with the smaller poles either 22-25 but I prefer the 22 most of the time.
The 22 reaches nearly all modern stuff including the odd roof Velux windows,it’ll clean all modern 3rd floor stuff it’s just that every now and again the 25 will reach from the hip rather than the shoulder when in use.