The battery sits in the box between the wheels.
The hose reel holds about 25 meters of micro bore, so no need to take trolley round the back.
This system has been used and abused for three and a half years with no problems.
The sack truck is a Clarke strong arm, I chose it because it's made of aluminium and is square in section.
Apart from bolt holes through the footplate, I did not drill any holes in the sacktruck, every thing is held on with clamps. The container carriers was part of an old ladder, the base plate was a piece of stainless steel work top from a pub kitchen, the pump box is half of what was someones overall locker.
The two pole carriers are made from some alloy tubing I scrounged, the original ones were made from plastic waste pipe. they are held on with exhaust U bolts.
The two tubes going into the barrels came from a pub cellar, stanless steel and have their own strainers built in.
I know it's a bit of a scrap yard challenge, but I am one of Matt's trolls, and he inspired me.