You need to check your hitch, usually they are 150-200lbs at the tongue. The volvo manual says 1500lbs total weight easily, but you can check it out at speed to make sure it is not wagging the car. Check the tire pressure in that Uhaul.

Don't be like some dodo brains that do 80mph, just stay even with the truckers.

When you hit the small hills in PA, you might want to shift to 4th, just so you don't lug the engine, 3rd if you have to.

Remember, going down hill is more dangerous than going up hill.

Klaus
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Common sense trumps a PhD