I'm jealous! My '14 freaks out until I turn park sense off.
Both my '12 and '17 Limited turn the rear park sensors off when you plug into the 7pin, now it could be 'cause both mine have the OEM trailer brake controller, or if your trailer doesn't have electric brakes (the u-hauls use 4 flats and surge brakes).
Now just in general to other posts in this thread..
Trailer ball, I've looked and looked most 2" balls are 6000lbs, but I've seen up to 8000lbs, a 10K 2" is like a Unicorn.. well anytime I look for one. You'd need a 2 5/16" ball for 10K. BUT if your ball mount is only rated for 6K, the ball rating doesn't matter, really for the ease of it they should almost be a matched pair, 8K ball, 8K ball mount. I have a 8K ball on a 10K WD ball mount, but I know that combo is only good to 8K, but the trailer I use it for is absolutely maxed at 8K including the trailer, so 5.5-6K-ish on deck.
Fuel and Tow/haul.. I tow on 87 octane unless it's realllly hot or I'm going to the mountains. Tow/Haul, empty 2K trailer, I don't bother unless it's hilly and I want the extra engine braking. Loaded, in the city sure, flat highway almost no head wind or even a tail wind I turn it off and turn if on before any hills.
Highway and cruise control, I use it... but once again for hills be prepared to cancel and take over otherwise the truck will just downshift and redline it to to try and keep the set speed. It's interesting sometimes going down the highway on cruise, tow haul off with a 7K camper and the truck will actually kick into MDS mode.