Any advice on a route with the least amount of hills/ mountains? I will be pulling a 30' travel trailer with a 2011 5.3L 4x4 Crew Cab Silverado. I have the highway friendly 3.42 gear ratio and not the optimal 3.73 ratio. The camper weights 6500lbs dry and i estimate about 6800lbs with the gear currently in it. I know with wind resistance i will be close to the 9300lbs tow capacity. It definitely doesn't like long or tall hills. What would be the best route to take to bypass the long hills of Missouri and the west side of Arkansas? Looking to start bypassing south of Sioux Falls SD. Thanks for your time and help!!