With that load you need to keep that tire pressure to the max... both front and back... A previous post stated that 80 PSI for E rated tires and that is what I see on the side walls of my tires... My Lance 981 max has struts from the camper to the hinges of the hood.. The help to soften the porpoise feeling... Does not eliminate it but I would not go down the Interstate without mine being installed... Play with the air pressure... Try a trip with 75 PSI and back off till you find a pressure that works for you... Ran mine at 80PSI until I put in the spacers allowing the overloads to engage earlier.. all the little pieces of the pie came together and now I am a Happy Camper.....Just Sayin