Okay - so I've finally started to make some progress. I hired a mechanic from the ESB (the Irish Electricity Board) to check it over, do a proper service and get it through the DoE test. It initially failed on some very minor stuff (bulb blown, no red triangle, bald and damaged tyres) but then passed.
I've since taken the back off while fully adhering to all health and safety legislation. No people or animals were harmed during this procedure (by sheer luck).
That box was over 2000kg.
Then I cut the cab in half!
I decided I needed to fit a second alternator because a) the current one is only 80amps and b) its 24v which would be a pain for sourcing much of the electrical equipment. So I’ve stripped the front off to get access and a friend is making up a bracket to mount a 200amp Bosch alternator (sourced from a diesel Mercedes saloon).
This is where it will go.
The I've identified a company to construct the shell/box and mount it. This has taken a few months! It's due to go to them in the next couple of weeks so I have to have the chassis ready for them. They’re also going to spray paint everything including the cab, but I have to do the strip down and prep.