I use the omnitrolly Classic version 50ltrs and think its an excellent piece of kit.
The large wheels do help a lot and will go anywhere.
I have not used any other trolley but if you look back through the old posts i know there is loads about them there.
I may be getting another trolley later in the year and its going to be another omnitrolly 50ltr but the type with the hose reel attached.
since swapping over from ladders we have never successfully worked a two man team on domestic.
I had two of us doing domestics and it was no quicker doing the same house together.
If you use a WFP you need one person per house.
But on a compact round this is not a problem one does one side the other the other side.
Paul