Hi Karen,
I have not used one at all , but I do have a good understanding of what they are good for. I been looking to start wfp cleaning for around 1yr now and in that time I have looked into this extensively. I primarily need to do cleaning at the end of tenancies. This trolley is useful because it is mobile, doesn't take up alot space in the van and most importantly will let me acces water from a house tap, which means I do not need to carry water in the van.With empty properties i will have unrestrcited acces to water and power or you may buy a trolley with a battery.
If you have or are going to do alot of residential clients then they might be put off by you having to use their water and or power and still charged them the going rate.
I am hoping to buy my system soon. Hope this helps.
Eduardo