Hi Ian, as a follow up, the way I load my 560 VIP, is,
1 full 6kg calor lite and maybe a 1/4 full one in the front locker with maybe anothe 5 kg of "stuff" water pipes water bucket etc.
Inside the van between the two front bunks are two Aqua rolls, under the left bunk is the hand vacum cleaner and a box of bits, a total of 5 kg.
Cuboard next to sink, potatoes and onions and three pots maybe 10 kg. On the floor between the cooker and the fridge, then waste master. Wardrobe Mrs H's clothes. Under our bed is the spare wheel, ( alko carrier I have removed ) and wheel ramp. Caravan table is removed, lives in the shed.
I travel normally with the water heater empty, Truma Combi blown air system.
Better some one with the advantage of a similar caravan giving advice.