Seriously though, these weight limits can be misleading - Citroens for example give a payload of something like 1200kg but they forget to mention that you need to allow for a full tank of fuel, a driver and passenger/s. My Toyota I believe, allows for a full tank of fuel before anything else is added.
Andy, I would think with two passengers and a full fuel load you would be very close to the limit.
Tank with water and boarding - about 700kg?
Two reels full of water                          40kg
Extra battery                                      10kg
Ladders                                                5kg
Vac                                                     30kg
poles                                                   10kg
full tank of fuel                                      70kg
Genny                                                  85kg
Bits and bobs                                        15kg
Thats about 965 kg before anyone climbs aboard