Seems like these threads are useful for people as the questions are always coming up. 2020 3500HD CrewCab Gas
Towed my Travel Trailer (7,000lb gvwr, probably around 5k-6k loaded weight) four hours distance on rolling hills. Average mpg was about 10mpg. The fuel tank and combined mpg made towing an easy going experience. I towed for four hours and didnt even need to fill up before getting to the RV park.
Issues: I don't like the hitch ball camera, i find it is not as reliable as my "hitchin' stix". Its my first time but I just cant align it right using video only. The sleeve 2" to 2.5" seems to have tons of play, didn't seem to cause any noticeable towing issues. Not sure, but my dash would randomly detect no turn signal connection but everything seemed connected fine. Sometimes the truck didnt recognize I had a trailer connected. Did some unplugging and resetting and seemed to fix it. And not surprisingly, parking and city navigating is not fun. Its doable, but its important to look at an area and pre-plan to realize parking garages and small busy parking lots are practically impossible to use. This truck width wise will take up all of an average space and needs extra depth as it is quite long.
Positives: engine braking in tow mode seemed rather responsive. Several times I wanted the engine to drop gears and it seemed to do it automatically. A couple times it didn't, Im not entirely sure what triggers it but I liked it when it worked. Cant compare it to the 6.0 4l80 but towing with this was such a dream compared to my 2002 1500. I like the trailer app and running the light test before leaving. The trailer brake gain was easy to adjust. Visibility was good. MPG was good. I wasnt expecting miracles when towing a giant wall behind me. I imagine the air resistance is primary stressor vs weight. I didnt notice any unusual gear hunting. Interior was super comfy, I have the optioned leather interior for LT trim. Remote start was great to cool the interior down before getting in.
I wondered if an HD truck was overkill for my trailer and I will deliver an emphatic NO. A half to can tow it but its not a fun experience especially when you drive over a long distance. Next trip will be to the mountains and Im really looking forward to it. We will get a fifth wheel at some point in five years or so and its nice to know we made a good long term purchase.
(to preface this, I towed this same camper for two years with a 02' 1500 Ext cab 5.3 with towpackage)