Yes, it does depend on how you load it. You either buy a noseweight gauge or use a bathroom scales with a piece of wood under the hitch (probably more accurate but fiddly).
Generally, the noseweight should be 7% of the MTPLM (unloaded) weight of your caravan. However, if like me that is more than your car can take, use that lower value that your car is allowed.
You may well find (again, like I have) that your caravan unloaded has a higher noseweight (100kg in my case) than your car can take (82kg). To solve this, I have had to put some cargo behind the rear axle of the caravan, to lower the noseweight. BEWARE - back-loading like this can make your outfit more unstable, although I must admit, I didn't notice any difference.