I use a piece of 4x4 inch, ( we are British) wood to go under the hitch head and use another two to get the correct height for my hitch, onto Bathroom scales.
Then adjust the nose weight in the caravan after the Boss has filled the caravan with waterever she wants, ie fridge , food, coats, etc
Then I load the nose weight to about 75 to 85 kg. For our outbound trip, I Know then that on a homeward trip the fridge, which is directly over the axle( so make almost nil). The gas used will be maybe 3 to 6 kg. And tinned food of 2kg. , my nose weight will still be within " My own Happy Setting"
to tow the caravan
Even on my longest 6 week trip around France, I never checked the nose weight , as nothing inside the caravan changed much. And it towed niceley.