Bit the bullet and bought a truck camper this year. Driven the beach lots with a truck only. Am used to airing down to around 20 lbs. With the camper, we bought E-series tires. You probably know they normally run with approximately 80 lbs pressure. My question: how low do I need to air down with these E-tires? Do I still need to get them down to 20 lbs? Or is a higher poundage okay? Looking forward to the first camper trip in August followed by several trips this fall.