Evening all.Could somebody give me a little advice on how to set up a trolley system for wfp.I got a backpack a month or so ago and although I find it very good I would like a system that carries more water.I've got a trolley which I can make amendments to,to take the water container.So,please correct me if I'm wrong,I need a pump and a battery,is that right?I've been reading about a varistream controller,is that necessary as well?At the mo I'm only using a 20 ft pole but I'm endeavouring to get my mitts of a 40 footer.If anybody could recommend the right pump etc I would need I'd be obliged.Apologies if I appear a bit clueless,I'm fairly new to this and I'm learning all the time.