I'm here
In Vancouver after 6 days of driving. Trailer weight was 1,500 lbs combined with cargo.
There was an ice storm on day 2 as we drove through mountains in Ontario. In that area two drivers ended up in a ditch. One driver totaled his pickup truck, while another sedan was flipped on the roof. I was a little more cautious by going really slow, didn't want to fly off the edge of a cliff. Ran out of gas at one point because there was no stations with premium for some 190 miles (300 km), but I had backup 5 gallons in the trailer that I brought on the trip, so that was the only time I needed it.
On day 3 as I was leaving gas station, the slope of the sidewalk was too steep, and the car being so low scraped the bottom as we exited. It caused the hitch to twist, and our coupler's pin's pin (the pin the secures the coupler pin) fell out. Spent 45 minutes looking for it, and when we couldn't find it, drove to CanadianTire to pick up a new one. But then the new one wouldn't go in, so spent an hour and a half trying to get it in before figuring it out. The coupler pin from U-Haul was drilled in the wrong place, so I couldn't fit it properly on my hitch. Bought a new coupler pin but it didn't want to go in, so I used a hammer (which I couldn't find in my cargo, so had to go buy it too... buy all the things), and hammered that f***er in. That was a good waste of 2 hours I could have been driving.
4,450 km total (2,821 miles). Gas mileage of 14.8L/100km (15.9 mpg). RPM was 2,500 most of the trip. Didn't let the rpm go over 3,000 on the hills to keep temperature under control; some hills so big that I was doing 30 mph in a 70 mph area. There was truckers that had engine blowout on some of these hills in The Rockies (Calgary to Vancouver route). Found trucker cargo left on the side of the highway without a truck present.
Most of the trip the GPS said "go straight for 700 km" (434 miles) at any one point. The last leg was "go straight for 900 km" (559 miles).
The prairies were just 1,400 km (1,126 miles) of driving straight. There might have been a rare hill or curve, but mostly driving straight, with nothing to look at as far as the eye can see.
Oil was at maximum the whole trip. Coolant never went below minimum. Temperature always stayed in the middle. The odd concerning engine sound, but it seemed to go away after the car rested for a bit. Switched from D4 to D5 on the long straights to get to 75 mph.
U-haul did read "maximum 55 mph" but there's no way I was going to drive that slow for the trip. Would have easily cost me 8 hours. The trailer seemed to fair fine at 75 mph. I had the odd concern that trailer might fall apart and I would spill the cargo along 3 lanes of highway, but it managed to survive all the way. Besides a bunch of dead bugs on the trailer front, seems to be in good condition.
So as far as towing with LS, was a lot of up-down sway when the road was bumpy or had pot holes. But most of the time it wasn't noticeable. Probably need new breaks and pads, but I needed those before leaving anyway.
Total trip fuel cost - $900.00 (average $1.32/L premium at 15L/100km).