but i dont want to trail a hose pipe everywhere, if i have a backpack, its lift and go,
I read what you say but;
You might be better off, when buying your poles, to ask for an extra 10 - 15 metres of internal pole hose. (eg, 18 ft pole = 50 feet of pole hose instead of the standard 18 feet + about 3 feet extra)
Pole hose coils up in a very small, light roll and it will make the job much quicker when you can work away from backpack, rather than moving it every couple of windows.
I have extra 15 metres and i can reach around all my standard jobs with a trolley parked half way down the side of house. Its also much quicker to gather in than microbore.
I use a trolley out of a van in preference to van mount on most jobs, but out of a car a trolley would be too awkward i reckon.