A dually would be the best choice for that camper but if your heart is set on it and a new truck is out of the question you would need to upgrade to commercial 19.5 wheels and tires (245/70R19.5) to give you a wheel and tire combo at each axle capable of carrying 9000 pounds because I guarantee that your rear axle will scale over 7500 with the camper. Then you will also be looking at beefing up the suspension. I went that route on my old SRW F350 and drove that way for years. I upgraded to a Dually 3 years ago and the ride is phenomenally better. wet my camper weighs 4600 pounds