I am with matt on this one,Its just a glorified sack truck, Now i detest DIY,but I got a job today which best suited my backpack. I have not used it since mid December, but charged it up yesterday. Well it would not work, but i remembered reading on here about problems with wires coming off the battery,so off i went to the van and took it apart and yes the negative spade connector was off.but as i pulled top off the backpack i.e the yellow bit which holds the water, the little hose came off the nozzle in bottom of yellow bit.well hose is that short i had no chance of putting it on,Tried and tried and ended up snapping the plastic connector nozzle in base of yellow tank.So I have thought sod it,I am going to use all the gubbins from backpack,get a sack truck and make a trolley capable of carrying 2x 25 litre drums. but as an afterthought i am wondering about using a fishing trolley as someone once suggested on here,does anyone think they will be strong enough?