Ill take a photo of my trolley set up.
But for cost of doing it myself and what the final product would look like, i concluded that the gardiner back pack wouldnt be that more expensive and it looks a whole lot more professional in appearance. Tho im van mount and only use it for the odd jobs.
But same as my van set up, i use a on/off valve at appropriate length on pole hose and then a good length from that to trolley. (So its a continuous hose)I have a holster on a belt which i clip the valve to, so its just one hand on my side for on/off and away i go. Cheap has chips