I thought about doing this too. problem is, as Trucker says, the law has changed. You cannot now do electrical work in certain 'wet areas' such as bathrooms and kitchens - including outside unless you are registered as a 'competent person'.We too have done this and the van is pluggedin all the time.
I think now the law has changed you would need to get the work checked and passed by a qualified electician. The way around it is by using the blue plug/3 pin. Make the lead long enough to plug in and job done.
Kevin
