You should always ensure your caravan is nose heavy.
I am aware that some older rear kitchen models had a problem of under balance (being rear heavy) when loaded as the contents of a kitchen (cooker, fridge, sink, etc.,) is heavier than bunks/beds and with the extras put in (food, cutlery, pots, crockery, etc.,) this can cause a problem for the unwary.
However, I have never heard of a 4 berth - which generally has the kitchen near the centre - having this problem unless loaded incorrectly.
I should add that I have owned two 4 berth vans where the configuration was as mentioned above and never experienced a problem in the 20+ years of towing both in the UK and on the continent.
As Stuartli says,you need the nose weight to be around the 65kg mark.A set of kitchen scales with a lump of wood propped under the tow bar on the caravan will help to check this. also the weight of your van needs to be less than 85% of your vehicle weight,(ideally -80%). Most heavy items should all be stowed centrally above the caravan's axle. If you don't brake heavily and drive sensibly you won't have any problems.
Yes you do get doughnuts behind caravan wheels who don't have a clue and drive far too slowly. Also you get "MINI METRO",drivers e.t.c who never go above 30 miles an hour with a senior citizen behind the wheel. When i used to tow my caravan i always hovered on the speed limit,be it 30 ,50 or 60 m.p.h,and it was always me that was in a procession with a slow driver at the head of the tailback,especially on country roads. Don't tar everyone with the same brush.