I find one of the skills at towing lareg heavy trailers is to not worry about going at any given speed, dont try to go to fast and on steep inclines find where the engine feels comfortable. Dont keep reving until you need to change up, then the engine dies and you have to change down again and the rev to high, change up etc etc.
just find where it sounds and feels comfortable nad if it is a little slower than you expected, just accept it and plod along :thumbs
I know I've disagreed with you from time to time about towing - but I agree with every word of that!!! :thumb2:thumb2
Cheers
Andrew