Sure, that I understood but with caravan, is it more safe to understand that as "Full Load".
I'm not a pikey, but I thought caravans we not supposed to put significant weight on the car.
I'm sure our resident professional pikey - Entwood - will give some proper, sensible pikey related advice 
I can try .. maximum "noseweight" for the towball is 100Kgs, regardless of the weight of the van itself, and that is the "norm" for most 'vans as well, although some do have lower limits. As "most" folk who caravan regularly are very aware of the problems that occur if the van weighs more than the car, or gets close to it, they tend to load the car with as much as they can. So a full boot, stuff on the backseat and the van on the hitch puts a fair weight over the back axle, hence the use of the "Full Load" tyre pressures to avoid saggy sidewalls leading to overheating tyres, and excessive lateral movement etc.
That 100kgs noseweight is actually pretty important, and most aim to get very close to it, but not exceed it, as it aids stability greatly, along with the old adage .. "heavy stuff over the axle".
https://www.youtube.com/watch?v=5rH-g7LDHeI