So Andy do you just wheel your trolley up the garden path, through the gate, avoiding the rabbit hutch etc etc. Of course a trolley makes sense if you have no obstacles, but what about some flexibility? Personally I carry the backpack when access is awkward (and I hate it, it's hard) and I put it on the ground with extension pipe when access is good. If I wanted a trolley, I'd get one that I put the backpack on when needed, not a hard and fast system. It's all about flexibility and your own jobs.