Hi
Many times you just have to make sure the weight is evenly distributed and don't stop too often as it gets a bit difficult getting on and off.
In Feb I went to Ireland with the Mrs and did not have much of a problem. You just have to adjust the suspension and make sure the tyre is adequately inflated which for the load you will be carrying.
Just be careful if the trip is on motorways as the tyre seems to flatten off with all that weight.