caravan weight

Hi everybody, We are a couple looking to buy a 3 berth braked caravan, as well as a car able to do the towing. We are planning to tow more than average, about twice a month around Ireland (6-7 days per month). After a bit of research, we found a caravan with MIRO of 650 and a MLTPM of 750 kg as...

I'm planning on using my caravan for the first time and I'm a bit worried I might end up overloading. Is there a specific way you load your caravan to prevent this from happening?

It is obvious that towing a caravan can affect your miles per gallon by quite a bit, but I'm just wondering to what extent it is affected. Does the type of going vehicle you have also have a role to play in this, or is it simply down to the weight of your caravan?