1) make sure you get the nose weight correct
2) make sure you get some speed up to go up a hill as this takes pressure off the engine and gear box.
3) if the caravan starts to snake, take your foot off the accelerator and brake, wait for the snake to stop itself. (you can buy an anti snake device, I am not sure how good these are)
4) pack everything at floor height to prevent the caravan being top heavy. (ie, dont hang you clothes in the wardrobe, keep it in a suitcase on the floor)