Anytime anyone says it can’t weigh much more than XXX lbs I kind of chuckle. I tell everyone to always add 1200-1500 lbs to the dry weight and this will get you very close without actually weighing. I know that section on I90 at the Missouri River. Although not huge it will tax the most non tow setup vehicle there is. A TV that is rated properly will pull that at 65mph without issue. So your 50mph really isn't all that bad. But for towing beyond IL I would want a truck with a V-8 and proper towing gears. Even if you got a V-8 1500 and you got the highest gears (numerically lower) you will be in the same position you are now.