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I have towed a 9000 lb 8 x 24 enclosed trailer with LM2. It did fine with no issues with power or handling.

These newer 1500 trucks are really capable if you spend the time to set them up properly and drive at appropriate speeds. People that have problems with sway one or more of these problems: tongue load to light, lack of or not setup correctly wd hitch, and driving too fast. For most Americans, it easier to buy a bigger truck than setup their trailer properly.

Step 1. Set your tongue to around 10%. Spend some time on a scale and move items around (if you haul RV, check and see how fresh/gray water impacts tongue)

Step 2. Determine if you need WD hitch. GM requires WD hitch over 6000 lbs at set it at 50% front axle load restoration (FALR) for 1500 models. To determine FALR there are two methods: front wheel opening height and front axle weight. Measure the truck without trailer (front wheel opening height to ground or front axle mass), Measure the truck in same matter with trailer attached without bars. To get to 50% FALR, you need to connect the load bars and put enough tension on them until fender height or front axle mass is halfway between your two previous measurements.

3. Take the vehicle combination for a drive at your typical driving speeds and see how it behaves when it's at 10% tongue and 50% FALR. If you still having issues with sway, you need to increase the FALR percentage. I would recommend small steps. The more you increase FALR the better for sway but worse for understeer.

These steps assume you are within the RGAWR, GVW, GCW of the vehicle. Reference your owner's manual for recommendations on WDH and what FALR %.

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2021 3500HD CC SRW SB 4WD
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We have a 2021 Silverado 1500 Z71 Duramax 3L and regularly pull an 8000 lb travel trailer. Just got back from a trip thru Colorado with passes up to 12k feet. No problems! In the past five months have put over 16k miles on the truck, much of it pulling the TT. While pulling we have seen mostly 12 to 14 mpg. Replaced TT tires with Goodyear Endurance (Made a big difference over China Bombs that came on it). Mostly pull at 60 to 65 mph and use the tack to decide what speed to pull. It seems to do the best between 1500 and 2000 rpm. If the rpm's get over 2000, we simply slow down a bit. Wind seems to be the biggest factor in determining mpg. Was able to get over 14 mpg in the mountains when there was no wind and slowed down to 60 mph. It pulls very comfortably at 70 to 75 mph but mpg sucks, so we just slow down. When not pulling and running mostly 70 mph on freeways have consistently seen 26 to 28 mpg, again biggest factor seems to be wind (we live in Texas). Have used regular factory maintenance schedule.
What model TT do you pull? Does it have an upgraded suspension? Do you have a WD hitch? Thanks!
 
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