I started out with a trolley system, one of Peter Fogwill's, it wasn't long before I adapted it to run as a mini van mount to run out of the back of my car.
If you have the trolley system, you already have all that you need, the only other thing you need is 100m of microbore and a hose reel.
Don't bother adding a hose reel to your trolley, if you are getting the trolley out you might as well just have a longer than normal length of pole hose (not microbore), enough to allow you to position the trolley so that you can at least reach two sides of the house you are working on.
Pole hose is easy enough to loop up and gather when you move on.
You can always get a small tank to fit in either your car or van so that you are not continually swapping from 25l container to 25l container all the time.
change and adapt, so many variables! Using WFP and working out the best system and method for your own round is a constant learning curve, you need to constantly evolve...
Ian