Truck should be fine, if your towing keep it in tow haul mode, thats your best bet. Before a hill climb or before passing someone or anything like that you could drop it down yourself into fourth to boost rpms then once at the top of the hill put it back into 5th or 6th and let the truck rev down. Keep in mind your peak power is probably around 3200 3600 rpm. But thats what i do towing my 27ft toyhauler. Once you've had your truck for a while you'll really start to learn how your truck acts in different situations.