Hi, I have exactly the same issue with my new LC300. The in built tow bar is set higher than the one I had on my old Prado so I had to purchase a right angle bracket to lower the the tow ball height. It's not an easy fix. When I tried levelling the car and caravan to the same height I did it unloaded. When we packed up to go for a trip the extra weight in the car caused a bigger drop when the van was hitched up and I had to take everything off and start again. I'm thinkingbof installing airbags in the rear springs to minimise the drop.