Interesting discussion, I have a Noseweight problem with our new, to us!, Triton 420. The Achilles heel,is a rear mounted bike carrier! On my first trip away in her I loaded the van as I had with our previous Puck L plus a single bike, about 18kg, on the carrier and checked the nose weight using bathroom scales, 15kg, panic!
I filled the toilet flush, the internal water tank, fitted a 20l water jerry can into the front kitchen cupboard (wonderful how much room there is in there) put the blow up awning, about 18kg across the van inside the door along with my clothing bag and a ham radio set in its box. Re-weighed 45kg, not perfect but she towed like a dream, rock steady on motorways and twisty, bumpy A and B roads.
I normally carry 7kg and 3.5kg propane cylinders, both are almost empty, I imagine that when these are full then the problem will be less, also the spare wheel is under the rear of the van, I think for our Spanish summer tour I may stow this on my Landie's roof rack, also, the battery could probably come forward about 4-6inches. If I can't get it sorted to then I suppose the bike carrier will have to come off and the bikes moved to the front.
Chris