I use a spray bar on my trolley setup which on a normal trolley isnt great. Also as you know i have 6 jets on my other brush which again a normal trolley couldnt cope with!!
Now i can choose which brush to use or if one breaks like it did today.....gooseneck valve control broke so had to switch brush to 6 jets and totally amazed myself with how the trolley coped.
Normally i only use the trolley perhaps less than 5 times in a month, sometimes non at all. But if a street for whatever reason suddenly becomes congested and i cant park up, im not gonna sack that work off for the day!!